My boyfriend and I had sex completely protected. I helped get his penis erect with my hand then we immediately put on a condom. We then had sex, he didn't ejaculate, and we checked the condom afterward and there were no breaks in the condom. I was supposed to get my period on May 1st and did not (it's now May 17th). So I took a Clear Blue at home pregnancy test a couple of days ago and it said "not pregnant." Something else to note is that I caught bronchitis on April 30th. I'm not sure if that plays much of a factor in my menstrual cycle. Also I've been having cramps like I'm going to get my period. What could be going on? One last thing, I'm 17 and I am not yet on birth control. Though I will begin birth control when I get my next period.