One of the most common questions I hear in my clinic goes something like this: “Doctor, I’ve been on the pill for two years. My mood is all over the place, my periods are different, and I’m worried about my fertility when I stop. Is the pill doing this to me?”
These are fair questions. They deserve honest, specific answers, not vague reassurance or unnecessary alarm.
This post covers:
- How combination oral contraceptive pills work
- Side effects that are common and usually temporary
- The risks worth taking seriously (VTE, blood pressure, mood that persists)
- The breast cancer question, answered clearly
- What research actually shows about weight gain and fertility
- Who should genuinely avoid combination OCPs
- What to expect when you stop
How combination OCPs work
Combination oral contraceptives contain two synthetic hormones: an oestrogen (usually ethinyl estradiol) and a progestin. Together, they prevent ovulation by suppressing the brain’s hormonal signals, specifically the FSH and LH surge that triggers egg release each cycle. They also thicken cervical mucus and thin the uterine lining, adding further layers of contraceptive effect.
The pill is highly effective when taken consistently. It is also prescribed for conditions beyond contraception: PCOS-related cycle irregularity, endometriosis pain, heavy periods, and acne. If your doctor recommended it for one of these reasons, there is a clear clinical rationale behind that decision.
Side effects that typically resolve in the first 1 to 3 months
Breakthrough bleeding: Light spotting between periods is the most common complaint in the first one to three cycles. The uterine lining is adjusting to a new hormonal environment. In most women, it resolves on its own by the second or third cycle (Speroff and Fritz, Clinical Gynecologic Endocrinology and Infertility, 7th edition, 2005). If it continues beyond three months, your doctor may recommend a different pill formulation.
Nausea: Some women feel nauseous, particularly if they take the pill on an empty stomach. Taking it with a meal or switching to a night-time dose resolves this for most women.
Breast tenderness: Mild fullness or tenderness in the first two to three months. This is the breast tissue responding to changing hormone levels and usually settles without intervention.
Mood changes in the early weeks: Some women notice shifts in mood, including irritability or low mood, particularly in the first month. If this settles by month two or three, it was a transient adjustment. If it persists, that is information worth taking to your doctor (discussed in more detail below).
The side effects worth taking seriously
VTE (venous thromboembolism)
The one genuine risk that deserves a clear conversation is VTE, specifically a blood clot in a leg vein (deep vein thrombosis) or lung (pulmonary embolism).
Combination OCPs that contain oestrogen do increase VTE risk. A large UK study by Vinogradova and colleagues (BMJ, 2015) found that the degree of risk depends on the type of progestin in the pill:
- Pills containing levonorgestrel (an older progestin, found in many standard pills): approximately 2-3 times the background rate, or about 4-5 per 10,000 women per year
- Pills containing newer progestins such as desogestrel or gestodene: approximately 3-4 times the background rate, or about 6-7 per 10,000 women per year
For comparison: the background VTE rate in young women not on any hormonal contraception is approximately 1-2 per 10,000 per year. During pregnancy, the rate rises to approximately 29 per 10,000 per year.
The main factors that amplify this risk: a personal or family history of blood clots, obesity, prolonged bed rest or long-haul travel, and smoking. If any of these apply to you, a detailed conversation with your doctor before starting or continuing the pill is important. Progestin-only options carry no oestrogen-related VTE risk.
Blood pressure
Combination OCPs can raise blood pressure slightly in some women. Your doctor should check your blood pressure before prescribing and again at your first follow-up. If your blood pressure is already elevated, a progestin-only pill or non-hormonal option is generally preferred.
Mood that persists beyond three months
A large Danish study of over one million women (Skovlund et al., JAMA Psychiatry, 2016) found a small but statistically significant association between hormonal contraceptive use and first antidepressant prescription. The effect was most pronounced in adolescents and with certain progestin types.
This does not mean the pill causes clinical depression in all women, or even most women. Many women take the pill for years with no mood effects at all. But if you notice a meaningful, sustained change in your mood after starting the pill, particularly one that persists beyond two to three months, that is important information to share with your doctor. Switching formulations or switching to a non-oestrogen option often helps.
The breast cancer question
This deserves a calm, factual answer.
A 2017 study in the New England Journal of Medicine (Mørch et al.) followed 1.8 million Danish women and found that current or recent users of hormonal contraceptives had a 20 percent higher relative risk of breast cancer compared to non-users. The risk increased with duration of use and returned toward baseline after stopping.
What does 20 percent higher relative risk mean in practice? The study found approximately 13 additional breast cancer cases per 100,000 women per year of use. For a woman in her 20s or early 30s, whose baseline annual breast cancer risk is already very low, the absolute excess from the pill remains small.
This is not a reason to refuse the pill if it is medically indicated. It is a reason to be informed and to bring up any family history of breast cancer when discussing contraception options with your doctor.
What research actually shows about weight gain
This is probably the most persistent myth about the pill.
A Cochrane systematic review by Gallo and colleagues (2014) examined all available randomised evidence and found no causal relationship between combination oral contraceptive use and weight gain. Many women start the pill during phases of life when weight naturally changes, such as the early 20s or after delivery. The pill is not the driver.
If you are experiencing significant weight changes after starting the pill, other factors are worth investigating. For women with PCOS, for example, the underlying insulin resistance drives weight changes regardless of the pill.
What research actually shows about fertility after stopping
This is the concern I hear most often from women with PCOS who were placed on the pill: “If I stop, will I have trouble getting pregnant?”
The pill does not cause permanent infertility. Research consistently shows that ovulation and conception rates return to normal within a few months of stopping. A study by Barnhart and Schreiber (Fertility and Sterility, 2009) found that median time to first ovulation after stopping was approximately 20 days, and one-year conception rates in former OCP users were no different from women who had never used the pill.
What can happen: post-pill amenorrhea. This is a condition where the period takes longer to return after stopping, sometimes two to three months. This usually resolves on its own. If your period has not returned after three months of stopping, it is worth investigating, because an underlying condition (PCOS, thyroid dysfunction, low body weight) is the usual cause, not the pill itself.
One clarification that matters for women with PCOS: stopping the pill does not give you PCOS. PCOS was present before you started. The pill was managing the symptoms, particularly irregular cycles and excess androgen effects on skin and hair. When you stop, those underlying drivers are still there and may become visible again. This is not a complication of the pill. It is PCOS showing itself as it always was.
If you are stopping the pill to conceive, tracking your cycle from the first natural period helps you understand your pattern. Read our guide to tracking ovulation for methods that work specifically for irregular or long cycles.
For women stopping the pill after a long time, the first two or three natural cycles can vary in length before the body settles into its pattern. During this phase, the Indian diet has practical advantages: low-GI staples like ragi, rajma, and dahi naturally support stable blood sugar and can ease the transition, particularly for women with underlying insulin resistance from PCOS.
If you have PCOS and are unsure whether the pill is the right long-term approach for you, or if you want to address the underlying drivers rather than manage symptoms alone, WhatsApp Dr. Suganya directly at wa.me/919940270499. A 30-minute consultation can clarify your options.
Who genuinely should not take combination OCPs
The World Health Organization Medical Eligibility Criteria (5th edition) identifies the following as absolute contraindications to combination pills:
Migraine with aura. If your migraines are accompanied by visual disturbances (zigzag lines, blind spots), numbness, or speech difficulties before the headache, combination OCPs containing oestrogen are not recommended. The oestrogen component can increase stroke risk in this group. Progestin-only options are safe.
Age 35 and above combined with smoking, particularly 15 or more cigarettes per day. The cardiovascular risk in this combination is not acceptable for oestrogen-containing pills. Non-oestrogen options work well.
Uncontrolled hypertension, specifically blood pressure above 160/100 mmHg. Lower levels of elevated blood pressure need individualised assessment with your doctor.
Personal history of blood clots, stroke, or ischaemic heart disease. Non-hormonal or progestin-only options are appropriate.
Known thrombogenic mutations such as Factor V Leiden. These conditions dramatically amplify the already-increased VTE risk from the oestrogen component.
Breastfeeding a baby under six weeks old. Oestrogen can affect milk supply in the early postpartum period. Progestin-only pills are safe and do not affect milk supply.
If any of these apply to you, a progestin-only pill, copper IUD, hormonal IUD (Mirena), or barrier method is a safe and effective alternative. Your doctor can help you identify the best fit.
For more on this, read our guide on Copper IUD & Mirena in India.
OCPs for PCOS: what they do and what they don’t
Many women in India are put on OCPs specifically to manage PCOS: to regulate cycles, reduce excess hair growth, or control acne. The pill works well for these symptoms while you are taking it. It does not address the underlying drivers of PCOS, which include insulin resistance, chronic low-grade inflammation, and in some cases adrenal androgen excess.
If you are using the pill as the only management for PCOS and you want to conceive, or you simply want to understand what is driving your condition and address it at the root, the lifestyle-based approach can run alongside your current treatment or replace it over time, depending on your situation.
For women on OCPs for PCOS who have also been prescribed metformin, read our metformin for PCOS guide for how the two interact and what each addresses. If your cycles were irregular before you started the pill, understanding why PCOS affects periods gives you a clearer picture of what to expect when you stop.
Practical questions to ask before you start or continue
- Which progestin is in my pill, and what does that mean for my personal VTE risk?
- Is there a reason I am on a combined pill rather than a progestin-only option?
- If I am on the pill for PCOS, what are we doing about the underlying drivers?
- How long should I continue, and when should we review this decision?
If your period was irregular before you started the pill and you have questions about what your cycle is actually like underneath, the period delay guide covers the common causes of cycle irregularity in detail.
For a broader look at contraceptive options, including the emergency contraceptive pill, read our i-Pill and Unwanted-72 guide.
You can also download our Period Health Guide for an evidence-based overview of cycle health, contraception, and when to investigate further.
Have questions about whether the pill is right for you, or what comes next when you stop? WhatsApp Dr. Suganya at wa.me/919940270499. She sees women navigating exactly these questions every week.
Frequently asked questions
Will the pill make me gain weight?
The evidence does not support this for combination OCPs. A 2014 Cochrane systematic review by Gallo and colleagues found no causal link between combination oral contraceptive use and weight gain. Many women start the pill during life phases when weight naturally changes, which creates a false association.
How long does it take for fertility to return after stopping?
Most women ovulate within two to four weeks of stopping. A study by Barnhart and Schreiber (Fertility and Sterility, 2009) found one-year conception rates in former OCP users were no different from women who had never used the pill. If your period has not returned within three months, that is worth investigating.
I’ve been on the pill for 5 years for PCOS. Does that make it harder to conceive?
No. Long-term OCP use does not impair fertility. Your fertility level is the same as it was when you started. Any difficulty conceiving after stopping relates to the underlying PCOS, not the duration of pill use.
My doctor recommended the pill for PCOS. Is that appropriate?
Yes. OCPs are a well-established approach for managing PCOS-related cycle irregularity, acne, and excess hair growth. It is also reasonable to ask whether lifestyle-based management, which addresses insulin resistance and other PCOS drivers, should run alongside the pill rather than leaving it as the only intervention.
I have migraines. Can I take the pill?
It depends on the type. If you experience migraine with aura (visual disturbances, numbness, or speech changes before the headache), combination OCPs are not recommended due to a small but real increased stroke risk. Progestin-only pills are safe in this situation. Migraine without aura is generally a lower-risk category but still requires individual assessment with your doctor.
Can I take the pill while breastfeeding?
Combination OCPs containing oestrogen are not recommended in the first six weeks postpartum when breastfeeding, because oestrogen can affect milk supply. Progestin-only pills are safe and do not affect supply. After six months postpartum, combination pills can generally be used if milk supply is well-established.
My period hasn’t returned three months after stopping the pill. What should I do?
See a doctor. This is called post-pill amenorrhea. The most common underlying causes are PCOS, thyroid abnormalities, and low body weight, not the pill itself. A simple blood panel including TSH, LH, FSH, prolactin, and AMH where relevant can identify the cause and guide what to do next.
