I am on birth control pills. Last month during my period week (sugar pills) I took the antibiotic, doxycycline, for only 2 days out of the ten days prescribed because I felt better after 2 days. The doc said this medication treats acne and most likely won't affect my bc pill. I had sex five days later on my new bc pill pack without a condom. It's been over 3 weeks I'm supposed to get my period this Wednesday and my boobs just started hurting. I read that this could happen before PMS or because of too much caffeine and I could fit both of those reasons. However, I also read it could mean early pregnancy and now I'm really scared. Do you think I'm pregnant?