Ok, so I am sexually active. I haven't had sex since the end of Feb because my fiance is study abroad. We ALWAYS practice safe sex. I started my period at the beginning of April. For the past year, the beginning of the month has been normal for me. I've never used tampons before, but on the second day of my period, me and my roommates wanted to go swimming, and I wanted to so bad, I broke down and got a tampon from one of them. Well, my heavy period stopped that day. It didn't start again. This month, May, I'm 4 days late. I normally start on the 7th, but started on the 11th. My period was heavy to the point I had to change my pad a little more than normal (My periods are so heavy i have to use overnights during the day which will last me about 8-10 if need be), but I had change about 2x as many times as normal. On top of that I'm having sever cramps (which is normal when I'm late), but Midol isn't working like it normally does. Also, today I woke with what feels like a pulled muscle on the left side of my back, which isn't normal with my period, as well as diarrhea, witch also isn't normal with my period. My breast are sore sometimes when touched, but that is normal for my period.I am tired, but I work long hours and go to school so that too is normal. A co-worker told me about how her friend had a period all through out her pregnancy and now I'm scared I might be pregnant. My fiance and I are in college and we aren't ready for this and i'm scared what are parents would say if they knew we were sexually active, and i do NOT believe in abortion. I want to take a pregnancy test to see, but I'm scared it might actually be positive. I thought I'd search the web to see if it was something else. Right now I'm hoping for Endometriosis. Does anybody have a suggestion as to what might be wrong with me?