So I am on birth control, but I got a sinus infection and I have been on amoxicillin for a week. I took the last antibiotic yesterday. Last night my boyfriend and I were having sex while I am on my period, and the condom broke, neither of us noticed. He pulled out because he always does, but I want to take a plan b. Will the antibiotic affect it especially if I took the last one yesterday and I take the plan b today?
If your periods are regular, & you therefore know it was a proper period, not just breakthrough bleeding, Plan B is a waste of time, because you aren't fertile on your period. It's worth researching how a menstrual cycle works.
Very few antibiotics affect Plan B. You can find out which ones do, by putting Plan B into the search field of this website, & checking which drugs provide contraindications. However, I can tell you that Amoxicillin is not one of them. It does not affect Plan B.
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