Quit having unprotected sex, would be your first step unless you are wanting to get pregnant. Second step would be to go get a pregnancy test and see what's up. When you play with fire, you will get burned sooner or later.
If you are worried about whether you may "get" pregnant---that still up to you.
If you are worried you may "be" pregnant, that's a different issue.
I would suggest using a condom until your next cycle of pills.