Has anyone else experienced this?

I’m 18 weeks pregnant and today I went out for dinner. It was a large plate and once I was finished I was so full and had bad stomach aches.

I then started to feel really hot/clamy and a as though I could feel a fainting spell coming on (can usually tell from my vision).

Ended up going to the bathroom (sorry TMI) and had some Soda (which I never drink) it seemed to help.

I feel better now but just very tired/exhausted.