It is very common and completely normal to experience a slight delay or temporary irregularity in your subsequent menstrual cycles after using norethisterone (Regestrone) to delay your period. Norethisterone is a hormone that temporarily alters your natural cycle. Once you stop taking it, your body may take one or two cycles to naturally readjust and return to its regular rhythm. There is no need to worry, as this is a temporary effect. However, if your period is delayed by more than a week or if you suspect pregnancy, a quick home test or a chat with your doctor can provide extra peace of mind.

After finishing a course of norethisterone (Regestrone), it is very common for withdrawal bleeding to take anywhere from 3 to 10 days to start. Since it has only been four days and your pregnancy tests are negative, this delay is quite normal, especially with your history of irregular cycles. I recommend waiting another three to six days. If your period still has not started by then, please reach out to your doctor. They can easily evaluate your hormone levels and guide your next steps.

Regestrone (norethisterone) is used to delay your period, but it is not a reliable contraceptive. Because you had unprotected sex, there is a risk of pregnancy. Your period should typically start within 3 to 7 days after you stop taking the medication. If your period does not arrive within a week of stopping it, or if you feel anxious, I gently recommend taking a home pregnancy test or speaking with your doctor for guidance and peace of mind.

You can have sex while taking Regestrone 5 mg, but it does not prevent pregnancy, so use contraception if needed. It is best to avoid alcohol, as it can affect your liver and may interfere with how the medication works.

Since follicles usually rupture when they reach 18 to 24mm, you will likely ovulate within the next 24 to 48 hours. Your previous irregular cycles after taking Regestrone (norethisterone) won't affect this immediate window because the scan shows your body is ready now. To give yourselves the best chance, I recommend having intercourse today, and continuing every other day (or daily) for the next 4 to 5 days (until cycle day 20 or 21). This ensures sperm are waiting when the egg is released.

Generally, if a full period starts before finishing the 21-day course, doctors often advise stopping the medication and counting this as the start of a new cycle. However, the exact advice depends on why you were prescribed this medication. I gently recommend contacting your doctor to confirm the best step for your specific treatment plan. They will help you manage this safely.