I think it really depends on how you feel physically, because some mums find the heat helps with recovery while others feel dizzy or drained after, so it is worth listening to your body carefully. If you are breastfeeding, the concern is usually staying well hydrated since heat can affect that, and every mum's recovery is different. It might be good to check with your PD or gynae first before going ahead, just to be safe, especially if it is early in your postnatal period.