Condom fell off during sex

Brooke

I just had my daughter two months ago and I'm freaking out... my husband and I had sex and we used a condom and when we were finished it was inside my vagina.. what are the chances I could be pregnant again? He thinks when he pulled out is when it came off and there was semen inside the condom. I also haven't started my period yet since having her, when should I expect to get my first one? What if I'm ovulating?