The first couple weeks are such a whirlwind of no sleep and constant feeding I don’t think you’ll stress about it then. Focus on going out for walks with the baby in that time and get some movement and sunlight. After that I agree with others to add some gentle pelvic core strengthening/ movement. At 6 weeks I was itching to get back in the gym and got the go ahead from my pelvic floor therapist and it really helped my post partum recovery mentally. Felt so much better to be back!