first time

So the other night me and my boyfriend had sex for the first time. It just happened naturally and unexpectedly, and didn't use a condom .... Because he hadn't bought any. But neither of us got of 90% sure he didn't get close. Then the next day it happened again and he got close before his mum came home. So I was worried about getting pregnant from precum. But then the day after the second time I got my period, is it possible to still be pregnant since the days were so close ?