What is the risk of pregnancy after starting a 21-day oral contraceptive pill (Femilon), taking emergency contraception (Unwanted 72) for unprotected intercourse on day five, having further unprotected sex on day thirteen, and subsequently experiencing a delayed period after completing the cycle?
Taking the emergency contraceptive pill, levonorgestrel (Unwanted 72), introduces a high dose of hormones which frequently causes menstrual delays. Regarding your desogestrel/ethinylestradiol daily pill (Femilon), if you took it consistently every day after starting, it would have been fully effective by day thirteen. While the risk of pregnancy is relatively low, the delay in your withdrawal bleed is likely due to the emergency pill. For your peace of mind, I recommend taking a simple home pregnancy test.