The "safe period" method is unfortunately highly unreliable, as ovulation cycles can naturally fluctuate, making pregnancy risk quite high. Regarding emergency contraceptive pills like the i-pill (levonorgestrel), they are designed for backup use only. Medical guidelines recommend using them no more than once within a single menstrual cycle. Frequent use can cause hormonal imbalances, leading to irregular periods and side effects like nausea. For regular protection, I highly recommend discussing safer, highly effective daily or barrier contraceptive options with your gynecologist.

The i-pill is an emergency contraceptive designed to work temporarily by delaying ovulation to prevent pregnancy in the short term. Its active ingredients leave your body quickly, typically within a few days, and it has no long-term impact on your fertility. If you have been trying to conceive and are experiencing difficulties, there may be other factors to consider. I highly recommend consulting an obstetrician-gynecologist for personalized support.

Past use of emergency contraceptive pills like the i-pill does not cause long-term damage to your fertility or permanent menstrual issues; its hormonal effects are entirely temporary. Since you have missed periods since July, it is best to consult a gynecologist. They can run simple tests to check for common, highly manageable causes like stress, thyroid variations, or polycystic ovary syndrome (PCOS). Restoring your cycle starts with identifying these root factors. You are young, and with gentle, proper guidance, your body can easily get back on track.

Given that both your blood and urine pregnancy tests were negative one month after intercourse, and you have had normal periods since, you are not pregnant from that encounter. Those tests are highly accurate at that stage. The darkening of your nipples and areolas is likely due to hormonal fluctuations, which are very common with polycystic ovary syndrome (PCOS). I recommend scheduling an appointment with your doctor to discuss your PCOS symptoms and manage your hormone levels.

Emergency contraceptive pills (such as levonorgestrel) are highly effective, preventing about 75% to 95% of expected pregnancies when taken promptly. The most reliable sign that it worked is the arrival of your next monthly period, which might be slightly early or late due to the hormonal changes. The only definitive way to confirm you are not pregnant is to take a home pregnancy test 14 to 21 days after the intercourse.

Emergency contraceptive pills (like levonorgestrel or ulipristal acetate) can sometimes fail if ovulation has already occurred before taking the pill, if there is a higher body mass index, or if vomiting occurred shortly after ingestion. If a pregnancy does occur, safe medical options are available. A medical abortion using a combination of mifepristone and misoprostol is highly effective in the early weeks of pregnancy. I warmly encourage consulting a healthcare provider or a family planning clinic.