So this is my 3rd month on bc and I have also gotton my period on the first white pill... I have alot of unprotected sex... I also found out a couple days ago tjat you cant hvae sex on bc while taking an antibiotic... I habe been on antibiotics 3 times so far and just last week as a matter of fact... I am really concerned that I might be pregnant... Its been 4 days and I take other meds that are extremely harmful to an unborn child... Please help !!!