Am I pregnant?!?

So me and my SO had sex about a week ago and everything was going good and then I had to leave but when I got off of him there was something that looked like cum on his thigh. He had a condom on so I was thinking maybe it just slipped out the condom cause there wasn’t a hole in the condom. But now a week later and I’m late when I was supposed to get my period about 3-5 days ago. And I’ve also been so stressed out lately with my grandpa passing away this week and finals coming up. Is it possible that I’m pregnant?