weight loss surgery

Hello everyone! My name is Sara, I'm 30 yrs old and I will be getting gastric bypass surgery on 6/17/2020. At my heaviest I was 400lbs, currently I am at 305lbs looking to reach a goal weight of 150lbs. I am slightly nervous but I know I am making the right decision for me.

I am a month out of surgery. The first 2 weeks I dropped 21 pounds, then was at a stand still for a week and now I’ve gained 7 pounds back. What is going on?!