Weight gain too high!

Kimberleigh
Need any advice!  I can't stop gaining weight!  This is my third pregnancy and the pounds keep on coming!  With both of my first two I gained 40 pounds, with this third on I am up 40 pounds at 32 weeks.  I have tried tracking calories, I walk at least 5 days a week for two miles, 30-40 minutes. 
I feel the harder I try the the more I gain😁