Heres my dilemma. My doctor put me on birth control 3 weeks ago today. Then i got strep throat last night, and my doctor put me on Amoxicillin but my pharmicist warned me that Amoxicillin could counter-act my birth control. Well, last night my boyfriend and i had sex without a condom. I was thinking it could get me pregnant, but then i started my period this morning. Is it still possible that i could be pregnant...?