Honestly if your DR isn't worried then you shouldn't be! It's that simple. I am huge for my size but we know I am carrying a big baby and he is cushioned with heaps of fluid as well. So far I have put about 10kg on and I only have one more day to go so I am not worried. It took 9 months to create a human so I reckon 9 months is a good time to TRY and get back to where you were before that and to be honest your body should have changed shape during pregnancy ie; hips and curves more pronounced to support your growing needs for a toddler etc.

Your a beautiful women who is blessed with child. Enjoy it and live healthy and all will be good.