Unprotected sex

I just had unprotected sex, my period is suppose to start tm or the next day... I’m on birth control and he came in me like pulled out most the way but like had the tip in and came. And so I figured I should be fine it’s the least fertile time and all and I’m on bc the pill but yesterday is started my first white pill (mostly pink then like 5whites) do since I just got off the pink pills does that mean anything? Do you think I could get pregnant now?