28 weeks tmi maybe

So I'm having abdominal pains it's not painful and it also is making my back hurt

I just had my 8th or 9th ultrasound or I done lost count after my 7th honestly too many to keep up

It all started at my appointment and I've tried it ignore it but I just can't anymore it's starting to really bother me

This is my second and I've never experienced this before

I drink nothing but water but today I got really really nauseated all day and drank 2 cans of ginger ale and a dr pepper I feel better after I'm no longer nauseous

I also have a lot of trapped gas that I can't seem to get out no matter what I do (this is normal for me even when not pregnant so I don't really think this has anything to do with my abdominal pain but it could be)

I need opinions on what it could be