Okay my boyfriend and I had sex a month ago and the same day, I was just coming off of my period. He never came. To be safe, I took the morning after pill within about 18 hours after intercourse. My period had started the 17th of that month, we had sex the 21st, and I continued bleeding until the 29th which puzzled me and still does. I went to the doctor's to get on birth control two weeks after the sex, took a pregnancy test, and it was negative. Since you have to be on your cycle to get the shot, I had to wait to start my next period so I am not on birth control yet, but I am now 5 days late which is preventing me from being on birth control. Should I be worried about pregnancy?