I'm on the pill. I'm having to take a course of antibiotics. I had unprotected sex the day before I started taking my antibiotics. I only had 3 hormonal pills left and took them on time with my antibiotics. The next week I had a regular period like I was suppose too and now I'm off my period and it's now a new week. I'm unable to get my new pack of birth control pills this week but I haven't done anything since before I started my antibiotics. I'm just worried because I know antibiotics make birth control ineffective. So what are my chances of being pregnant??!