beyond worried!

pregnant with my 2nd it's a girl & I am 22 weeks & just hit 200 lbs!! I was beyond nervous about getting this big in the past I had a depression about my weight..now that I'm gaining it back is nerve wrecking for me I know the scale isn't the best thing to go on right now but I can't help but try to feel ok being big...I really care about my baby's health but what can I do to keep my weight down ?