19 weeks and belly seems to have gone down?!

Just wondering if anyone else has had this happen? I am currently around 19 weeks and for the past several days noticed that my belly seems smaller! I had my anatomy scan at 18 weeks 1 day, the ultrasound tech said everything looked normal and healthy with strong hb. Had been going to the health department for maternity care up until this point, will have my first actual doctors appointment Oct 5th. I am worried because even my mom has noticed the slight "deflation" of my belly. Granted, I had been feeling extremely bloated and I take iron supplements which makes it worse (I laid off those for a couple of days)... now I feel less bloated in my upper abdomen but the smaller belly is worrying me!! I have felt what I believe to be baby flutters as recently as last night. I have an anterior placenta though so baby movement isn't very easy to detect. Any thoughts?