How long did it take u to lose ur pregnancy weight?

I gained about 50 lbs during pregnancy which was mostly fluids that I retained due to having pre-eclampsia. its been 5 months since i gave birth and all i've lost is about 20lbs 6 weeks after giving birth and nothing else till now.. i went on diet and do moderate exercise but not losing any!i am really tired of feeling hungry all the time,soon i will decide to quit my diet cuz am not seeing any results! how long did it take u to lose ur pregnancy weight? what did you do to lose it?