Should I be worried?

Two days ago I had sex with my boyfriend, we used a condom. The thing is that after he came, he kept going for a while because he wanted me to come too, since I was close. When he pulled out the condom slipped off his penis and some of the semen contained in it spilled on the back of my legs/butt. The condom was stuck in me, half of it was inside and the other half outside. What do you think? I mean, what makes me paranoid is the thought that maybe the condom also moved a bit while he was still thrusting inside, since it felt a little loose. Is there a chance some of the semen contained in the condom somehow spilled? Idk I’m kinda worried 🙁 even if my bf says that if the condom came off while he was inside he would have noticed because sex would have felt different. By the way, the condom didn’t break, we checked.