I had unprotected sex, though he pulled out but i'm not sure if in time, 3-6 days before my period. what is the probability i could get pregnant?

Depends: Likely your partner deposited at least a few drops of semen if not more and each drop has about 20 million sperm in them. The pull out method is a horrible method. You should probably go pick up plan B or another form of emergency birth control and schedule to see someone about regular birth control. If you ovulated very recent then very possible