How soon after you start antibiotics do they affect your birth control?
I have been taking Tri-Sprintec (generic for Ortho-Tricylcen) for over a year. I was prescribed antibiotics (Augmentin) for a UTI. I started the antibiotics on day 9 of my b.c. pack… and my husband and I had unprotected sex two days after I started the antibiotics. Is it possible that my birth control could have failed that soon and that I might get pregnant?
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Usually when the antibiotics effect bc your doctor will tell you to use other measures. I would call and find out if they do interfere. If they did it would happen pretty quickly so you could possibly be pregnant.