Birth control help!!

So I just finished my three month pack of birth control and didn't have time to get another until a week after. I still have to go pick it up from the pharmacy...I also haven't had my period yet but my boyfriends birthday is coming up pretty soon and I want to give him a pretty great surprise..if you know what I'm talking about...is it okay to have sex when I have taken my birth control NOT after my period and a week after?????