Stomach feels odd??

Meghan • Baby girl April 2020 🍼💕🎀🧸

So is it ok if I’m having slight back pain and tightening in my stomach around my belly button or should I be concerned? I still feel her kicking but my whole stomach and back feel tight, like I’m wearing too tight of pants even though I don’t have any bottoms on currently?? It’s most noticeable around my belly button and hips. I’m 31 weeks and first pregnancy. I tried drinking water to see if that would help but it’s not making any difference. Any advice or suggestions? Thank you!