Uncomfortable

I am 19 weeks and have already gained 23lbs this pregnancy. My OB isn’t worried since I was only about 110lbs to start with. But I am super uncomfortable, like I just feel so heavy (most of the weight has gone to my butt and thighs) walking and standing make my hips, legs and feet ache. I am just wondering if this is normal for second trimester? This is my second baby but with my first I started out at 93lbs and only got to about 118lbs. So I’ve never really weighed more than that. I feel like my body isn’t used to being this weight so it’s struggling to hold me up 😂 if that makes sense