I've gained too much weight in the last 19 week (didn't gain anything in first 11 weeks)

I have to take the 3 hrs glucose test.

I'm freaking out, I don't want to gain any more weight, and I don't want my baby to be in danger.

Can someone please give me any advice?

When I asked my Dr yesterday what could be the reason for gaining this much, she said "maybe your baby is too big". And I get that, but I'm huge as well, I can see it in my hips, cheeks arms...everywhere!

TIA