If you had a natural no problem labour, I don't see why you can't start lightly. Stop if you feel discomfort or pain. But I'd phone your midwife/doctor first just incase. But you know your body better than anyone x
Csection- no. Natural- I still wouldn't recommend it. your baby has been through a lot it's standard to be on 6 weeks of pelvic rest for a reason. You could easily reinjure yourself.