If my period was on september 1st and i had unprotected sex on september 12th but he pulled out and my most fertile days are the 12-17 am i preggo?

Maybe: Unprotected intercourse is a bit like Russian Roulette--in any given month, you have a 25% chance of getting pregnant. Pulling out only decreases the odds a little. If you want to know if you are pregnant, do a home pregnancy test in about 1 week. Start on birth control pills so you don't take this risk again. You can get them free at the health department. Best wishes!