Drinking sodas

I use to be a soda drinker but I drunk water as well before pregnancy. Well I cut back on the sodas when I got pregnant, I’ve been getting Braxton Hicks since 24 weeks and I cannot drink not one soda without them coming back to back. I have to drink straight water for them to be calmer.. why is this? Is this my body telling me I’m dehydrated or something? I only drink sprite as well. Soda is soda but I haven’t been drinking them, everytime I get one which is every blue moon my Braxton Hicks starts coming frequently.. I’m now 32 weeks and I understand you get Braxton Hicks more frequent the closer you near birth but this has been happening, I can’t drink soda or they come a lot