Obese and pregnancy weight gain...

Im consideres obese. 5'0" and pre-pregnancy 199.

Im trying hard to be as healthy and possible with this pregnancy and not gain too much weight. Of course, i cant help but indulge in some unhealthy foods once in a while. But im trying hard!

Anyways. Im 23w3d now and at 205... so ive gained about 6lbs so far.

Im just wondering how much weight i should be aiming to gain for the remaining 16 weeks?