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.
Search for questions
Still looking for answers? Try searching for what you seek or ask your own question.
Updated 18 Jan 2014 • 3 answers
Updated 30 May 2018 • 5 answers
Updated 2 Apr 2015 • 1 answer
Updated 21 May 2017 • 1 answer
Updated 19 Sep 2017 • 1 answer