I am 5'9 and started at 190. My Dr. said a 30 lb. gain is healthy for a woman with normal BMI, but since I was in the next up category of "Overweight" I should try to only gain about 20 lbs. Here I am at 23 weeks and I am up 20 lbs. already! I am now swimming to try to get stretched out and keep in shape without stressing my joints...hope between it and healthy diet I can stay under 30 lbs. ....I can tell if I succumbed to my cravings every 2 hours I will gain way more!
Are you asking for you? How much you've gained to 9 months? Or the baby, how much it should weight? Honestly in both situations, everybody is different, mom or baby.
Some babies are born bigger than others, some women gain more weight than others. At the end of the day what matters is that you have a healthy baby and you are healthy too. If there are weight concerns your doctor will let you know, so listen to your Doctor.