When did you start abdominal exercises?

I only walked till 6 weeks and then I started a program through restore your core

You can start doing some breathing exercises, bringing air in your ribs to aleviate pressure down and softly breathing out imagining a corset but only very softly and a few breaths per day... It will help feel softly stronger also breath out as you do amy sort of effort will protect your pelvic floor and get you core so slowly get activated.
Everybody heals differently and we all have our own timelines... There are plenty of great but extra gentle postpartum recovery exercises like strateching shoulders, bringing space in the ribs that will ease getting back into exercise.

6-8 weeks I wouldn’t start ab stuff before that because they need to heal and you don’t want to start working them out while not healed. But I think you can work on like breathing exercises and just walking to help just stay active

They cut through soooooo many layers. I couldn’t start any hardcore an exercises or program until 12 weeks.i know you want to move your body but be patient because pushing it could make it worse thus leading you not working out for a longer period. Please ask your doctor.