I had sex with my boyfriend and on 04/10 & 04/16 he finished inside of me. I am on birth control pills. However, I am also on Augmentin (antibiotic for a sinus infection). My last period was on 04/01. Anyone have any ideas?

While pregnancy is possible, odds are in your favour that you won't be. You'll have to wait until you are due for your next period however to see what happens.

In the future, if you aren't pregnant, be sure to use a back up form of birth control when necessary. It would actually be wise to use two forms of birth control all the time to lessen the odds of an unplanned pregnancy even more.