What is the risk of pregnancy after unprotected sex for a 17-year-old with a 28-day cycle?

With a 28-day menstrual cycle, you are likely to ovulate around 14 days after the first day of your last period. If your last period started on 24th May, ovulation might have been around the 7th June, and you mentioned having unprotected sex just recently. This timing could fall within the fertile window (5 days before and 1 day after ovulation) increasing the risk of pregnancy. Considering this and the presence of the white fluid, there might be a risk. Emergency contraception can significantly reduce the risk if taken as soon as possible after unprotected intercourse, ideally within 72 hours. However, since you’re being treated for malaria and experiencing vomiting from the medication, this may impact your ability to absorb an oral emergency contraceptive. You might need to consult a healthcare professional promptly who can suggest the best type of contraception for your situation. A healthcare provider could guide you whether other forms of emergency contraception are more suitable given your current symptoms and treatments. If vomiting persists, they might consider administering the medication through a different route like a copper IUD, which is a highly effective form of emergency contraception if inserted within 5 days. Remember, finding an immediate way to speak with a healthcare professional soon is crucial to ensure that you are making the safest decisions regarding both pregnancy risk and managing your malaria treatment effectively.