2 months postpartum- unprotected sex!?

I am 23 years old ftm to a 2 month old. It took me 8 weeks after having my baby to finally have sex! I finally did and lets just say last night he accidentally came inside of me🤦🏽‍♀️ I feel like I already know the answer but could it happen so soon? Ladies out there with a similar experience?

I think I started my period 2 weeks ago but I didn’t pay much attention to my fertile window because a week after I thought I had a normal 5 day period, I had another period. So I know its very possible to get pregnant again. Im kind of scared thinking of being pregnant again so soon. I also haven’t gave birth control a thought since I’ve never been on it.