im 17 and recently became sexually active (only about 4 weeks). my periods typically last 5 to 6 days but my last one only lasted 2 and now im starting to eat alot more than i normally do. i freely admit that i didnt make the best choices so iv had unprotected sex before. my next period is due in 2 weeks but i recently found that my nipples(not my whole breast) are sore and its really worrying me. iv let my boyfriend know about the possibility and hes being supportive and has let me know that hell continue to support me no matter the outcome, but i still want to know as early as possible so i can make a lifestyle change if needed. can anyone offer any advice as to what to look for or do to help prepare?