weight gain

Hillary
I'm about 30 weeks. 
How much weight is normal to have gained at this point ? 
I was 155 and now I'm 177!!!! 
I was considered over weight before. And I hadn't gained anything until 5 months so I was pretty happy with no weight gain but now I can't stop gaining ! 
I don't eat healthy .... but I don't eat any more than I used too before pregnancy. Ugh and my fat is gaining in my arms and legs. Like eewwww