Baby’s tummy too big - dusbetes?

Tuli • 39yo. Pregnant after 1st FET. Ttc since 05/16. 2 iui, 2nd ended in chemical. Cervical stenosis after lletz

I had my 20 week scan yesterday and everything looked good apart from baby’s tummy which was too big compared for her other parts. Dr thinks this may suggest I have gestational diabetes and sent me to the GTT test today, I will get the results in 5-10 days.

Anyone has any experience with anything like that?