I am 15 years old and I have not had a period since about February. In Feb I started on my school Track team and did heavy exercise. My boyfriend and I have also been fighting for the past few months and I have been very stressed out. But we have also had unprotected sex with withdrawal though for the first time in... last week of March I think. We were both virgins before. We had sex about every other weekend after that untill last week. I'm thinking I could be missing my period because of stress, over exercising, or pregnancy. I lately have not been hungry and get naucious @ the thought of sight of food, but when i start eating it I feel alot better. My stomach has also been producing gas so I have been burping. (I think the burping is from going to this camp with bad food and to much candy and greasy camp food and pop though.) I show no signs of pregnancy other than being somewhat naucious. What's wrong with me ? just for the past 2 days i feel like i should be getting my period though.