Is there a chance I could get pregnant?

Well yesterday me and my boyfriend had sex, not for long though it was just for about 10 minutes and he pulled out when he was going to ejaculate... I know it was stupid but I know now never to do it again. I know there is pre-*** and I was wondering if there is a high chance I could get pregnant. I just finished my period 5 days ago and I was wondering if there is a high percentage? Thanks