about 2 and a half weeks ago, me and the guy I am seeing had sex twice within the same weekend. I was taking antibiotics (amoxicillin) at the time for strep throat, and I am also on birth control. It did not occur to me at the time that it may lessen the effectiveness of the pill....we didn't use a back up and he came in me both times. Here I am now almost three weeks later, with very strange cramps....very similar to my period, but not as intense, and I also have very intense leg and feet cramps. My period is due on Thursday. Is it possible I could be pregnant?