I have a sinus infection I was given 10 days worth of amoxicillin I am on the 5 day of that and I am also on nexplanon I've had it in me for over a year and I've been on birth control for the last 3 years. My question is my boyfriend and I had unprotected sex yesterday so should I worry about it or am I ok. I've read antibiotics are a bad mix with birth control but I also read it's only certain antibiotics are and amoxicillin is not one of those.