Hi, I m 16 years old and my menstrual cycle is always 30-32 days, I m never late and I always chart them. But this month my boyfriend and I had unprotected sex around when I should obvulate(I don t know the exact day) and he got some sperm on my vagina when he was pulling out. This month I was 3 days late and had absolutely no pms symptoms when I normally get emotional, sore breasts, and bloating. When I started my period it was more of spotting, which I ve never had. And then there were clots and it stopped after two days, when I ve never had a period less than 5 days. Why has this happened, and could I be pregnant? I took a test a day before I should ve had my period and it was negative and I took one on the morning before my 2 day period started and it was also negative. I also haven t made any changes in diet, exercise, or stress so it wouldn t have been because of that. I was irritable the whole 3 weeks after ovulation before the short period. During the period I got very dizzy, weak, and tired. If I were pregnant, I would be 5 weeks today since the beginning of my last period. Thank you for your help.