Last weekend I lost my virginity. My boyfriend didn't use protection. My last period was June 24. I haven't had my period yet. Is it just because I'm paranoid? How many percent chance can I be pregnant?

Well being pregnant is either a YES or NO, there isn't anything in between.
Anytime you have sex there is the possibility of babies.

Now your waiting starts for your next period.

100%.

(That's the percentage every time you indulge, so think twice before having sex.)