I've never been pregnant but I am on the pill. It's possible, but unlikely you are pregnant from missing 2 pills. What I've been told is that everyday you miss the chances go up, but it's still better than no pill at all.
My friend was off the pill for weeks before she could get pregnant. I'm sure that isn't the same for everyone. I think maybe you should call the doctor. If you are pregnant, but don't know, if you stay on the pill will it hurt the baby? I'd call and ask that. Everything I read about that was inconclusive for the most part.