You could be just retaining alot of extra water, every women's body is different! I'm pregnant with my 2nd child and I'm bigger but have gained less with this one, if that makes sence. Just try to elevate your feet as much as you can. Talk to your doc if you're having any issue's!
I am also incredibly swollen. I am not even wearing my rings on my fingers for weeks now. Even my husband's socks also feel like they're cutting off the circulation in my feet. At my last dr's appt the new nurse thought I was with twins. It's just the last weeks of the pregnancy :) I am almost week 39 now.