OPKs Question

First cycle postpartum! Got 2 positive opk yesterday and this AM it was “peak”. We had sex on Wednesday, will try to today (with 2 littles it’s not the easiest to find time haha). I felt crampy/bloating last night and mega nausea on Tuesday.

Is there still a slight chance of conceiving with the sex in Wed? I also am not 100% sure if he pulled out fully or not.