Losing Weight at 20 weeks?

about a year ago I was 170 pounds. since then I've gained all the way up to 195 lbs pre-pregnancy. (Due to stationary work position, being pregnant in October/November then miscarrying and needing a methotrexate shot)

I'm 20+2 today and weighed in at 213 (although it was in the afternoon right after lunch and all the fluids I drank for my ultrasound).

anyone lose weight 2nd/3rd trimester due to walking more and eating healthier? I just recently bought a treadmill too and walked 6 miles on Saturday.