TMI "intimate time" question

So my husband & I are going at it, I'm doing my work on top, you know how it goes, y'all are pregnant too, you know the drill. Well the next day my butt is SO sore like I was in the gym doing squats with some heavy weights. It's still sore! Has this happened to anyone else? Is it due to the pregnancy, being more sensitive or something? Maybe it was like a preggo workout? I'm 14 wks 1 day.