I'm 31YO female (161cm/50kgs) and had an intestinal resection in December 2018 which left me with a caesarean like scar. I noticed that sometimes my stomach bends in when I sit up in a certain way, sometimes it's worse, others subtle. Is this Diastasis Recti? I only can find information stating this affects mothers. So I have no idea how I ended up with this. Attached photos.