Feeling LARGE

Baleigh
I'm 29 weeks, 145 lbs (stared at 112). Yes I know I've gained a lot, mostly belly as you can't see any weight gain anywhere else in my body. My dr said its okay because I was considered very underweight for my age/height. I'm getting so very uncomfortable; moving, getting up, bending over, having sex etc. anyone else feeling this way? Is it normal at this time of pregnancy? Is it because I was so tiny before that I feel just HUGE!!?