Well, i'm not an expert or anything, but I think it's possible you could be pregnant, since you missed the pill, and then stopped taking them. However, I wouldn't worry about it. Since you stopped taking the pill you could be starting your period. The only thing that stops your period when you're on the pill is the hormones, so it doesn't matter that you shouldn't start til next week, because you stopped the pills early. I think that it would probably be too early for a pregnancy test to work, but I don't think you would be pregnant anyway. If you haven't gotten your period by the end of next week, then go to the doctor and ask to have a test done. They can tell you. And if it's negative, then I would suggest finding a form of birth control you can remember to take, especially if you're having unprotected sex and don't want a baby.
Daile