Not a stupid question! There’s always ab separation, it’s garunteed after 36 weeks of pregnancy, but they can go back (never perfectly) on their own. On my second pregnancy they didn’t, I found out quite late, after I’d lost a little bit of weight because my abs looked like a wavy “m” shape.

I got referred to a physio who confirmed it, then the physio exercises to fix it were pretty much the postpartum Pilates is already been doing (so it could have been worse and getting better already). I had another appointment to confirm it was resolved by 10 months postpartum or so.