Weight gain... when does it enndddd

I am 39 weeks. Have gained 50 pounds. Was about 20 over my "normal healthy" when I got preggo. Feeling so discouraged about my ability to get the weight off. I want to have this baby to stop gaining and get back o track! And I'm worried I'll get frusterated with the weight loss after. This is #3. My first two, I was able to stay in shape and drop the weight. This one... I'm feeling so defeated. The number on the scale just had me rocked. :/