20w and quickly gaining

I'm currently 20 weeks pregnant and feeling really self conscious about how quickly I've gained. This is by far the most I've ever weighed. I haven't told my mom, who I tell everything, because she's made comments about my body in the past that she didn't think would affect me but were actually really harmful to me. I went from being 125lbs (a bit underweight according to my doctor, admittedly because of my bouts of anorexia and depression) and I'm only halfway through and I'm already 143lbs. I just feel awful.