Unprotected sex after having baby

I'm going on 4 weeks postpartum an well my boyfriend woke up an did a quickie no condom an he kinda came in me a little bit I know it's all stupid I know but no going back now anyways what's the likelihood of me getting pregnant again I'm breastfeeding an haven't gotten on birth control yet I'm pretty sure he just kinda forgot I thought he was going to just pull out which he did after I turned around and said "you did not" we've been having sex but using condoms to prevent pregnancy please no bashing I know the risk of infection and I know how irresponsible it was but shit happens anyone else been in this boat what was your outcome