5 weeks PP and...

Im 5 weeks PP and i had sex today. I know, you are supposed to wait till 6 weeks or after. It just happened, and it didn't hurt and i felt healed up. Anyways, i think he came twice...but he pulled out when he said he came I'm afraid ill end up pregnant again from precum. I know i should have waited and i know i should have got protection but like i said it was just the heat of the moment. Just hoping im over reacting. Has anyone had sex early and not gotten pregnant again? Just really anxious...thanks.