I lost my virginity on October 3. We used a condom, but I later learned that we did it on one of my fertile days. He says that nothing got out of the condom. I had two periods, both coming on the day they were supposed to (October 22 and November 24), but they were different than normal. They lasted 6 days and during the first days of each the flow was pretty heavy and there were clots and all that stuff, but they seemed to be a lot lighter than usual during the final days, and in the November one the blood was browner than usual too. It's December 12 and I feel like my stomach is bigger than normal (it's always bigger in the evening than in the morning) and it hurts to press down on my abdomen. Last week I was having nausea and there was a lot of mucus in my throat, but I was prescribed something that took away both of those symptoms. I'm only 17 and I have really bad anxiety, so I guess I just want to know if the two periods were really periods and how many periods I have to get to be sure that I'm not pregnant.