I have been on my birth control for I think 2 or 3 years now. There has been times when I missed a day or took it late, but lately I've been on time. It started last month May 17, my boyfriend and I had sexual intercourse and he ended up coming in me. I got scared and went to the bathroom and washed my inside as good as I could. I got more scared cause that was the week of my period. I then bleed a little amount of blood on monday or tuesday and then for the rest of the week my period never came but I did cramp like I was going to. I took a test and came out negative, I then took a test every week and it still came out negative. Now for this month, this is the week of my period and I have not had my period but I do feel cramping like I'm about to start my period. I still took my birth controls from last month to this month. I'm starting to get worried that I might be pregnant but every time I take a test it comes out negative.

I also remmeber a friend telling me when she was on the birth control, her period didn't sometimes come for months and she was never pregnant. Am I over thinking things? I really don't know what to do, every test I take comes out negative. What could be the problem?