Sex a day before my period without protection..

So I had sex last night with a friend , but we both actually smoked and drunk and that’s how it ended up starting those things . He’s a major pot head smokes at least 2 to 3 blunts a day so he’s always high or mello. We didn’t have protection . We just went for it , he stopped when he was about to cum and he pulled out then 30 mins later we had sex again without a condom . I know it was stupid move , but what are the chances of me getting pregnant if my period is actually tomorrow ?