Still getting asked...

I've been either told "congratulations" or asked "when are you due?" 4-5 times this week... I'm 10 wks pp and while I lost 20lbs the first week after giving birth, I've gained another 8lbs on top of the other 10lbs I still had left to lose. It's all in my belly so I still look preggo. I walk 3-4hrs every day and eat healthy so i am not sure why I'm not losing any weight! What are you all doing to lose the lbs?