If there’s any fitness instructors near you who specialise and run any new mum or mum and baby workout classes sometimes they’re trained to check. I’ve started going to mum and baby workout classes myself and the instructor volunteered to check us all for this at the beginning of the session. It involved me laying in my back, when I breathed out I had to lift my head and shoulders of the mat and she ran her fingers down the middle of my stomach to check for any separation
I had mine checked and was given exercises by a mummy MOT physiotherapist. It's private but not very expensive.
https://www.instagram.com/movelikeamotha?igsh=MXE5aWJ5Y2hmM3d1cg== https://www.instagram.com/postpartumstrength?igsh=MThlZThieThiMm1vOA== https://www.instagram.com/the.belly.whisperer?igsh=cjdmbzFoeW1zNXM4