Talk to Gynecologist on Exercise After Delivery

Asalamoaleikum. I’m a 33 year old female. Delivered a baby two months ago via c section. This is my third child. My height is 5’7. Current weight 75kg. I’m having sudden pain in my legs in the sense they get stiff suddenly so much that I walk weirdly. Now I want to ask if this is due to the increased weight and whether I should work out do yoga or walk to reduce weight or wait for some time and allow my body to heal and reduce naturally.