Ladies pain question

( 25 weeks pregnant & live in Florida) So the past week I’ve been having very bad pain in my back and belly to the point where I needed to sit down to feel better. Take into perspective I’ve been up & moving around a lot more like cleaning my house, my sons first birthday party so it’s hours on my feet but still hurts when I sit down! It comes and goes when it pleases and I’m not sure if I should go to the Er just to get everything checked out or if I’m doing something wrong, maybe on my feet for too long, maybe not enough water intake ? Just would like to know if anyone else is going threw the same!