32 weeks and measuring 29??

I turned 32 weeks yesterday and had my routine check up. The physician assistant measured my fundal height at 29 weeks...this really worried me since my doctor measured it right at 30 when I was 30 weeks. In the past few weeks, I’ve lost a few lbs, but my doctors initially told me not to worry because I was just diagnosed with gestational diabetes. I know that a lot of articles say fundal height isn’t all that accurate, but the fact that it’s decreased and that I’ve lost weight worries me!