I was also 142lbs before delivery and now is 125lbs. Almost 2 weeks after delivery but the weight has been kept for 3 - 4 days. I think the weight is not that important but the belly is. I still got a large jelly belly. :(
The eastern hospital has taught us some postnatal excise and I practise them these 2 weeks. I find they are very helpful. The jelly belly has reduced from 33 to 30"