Pain in left side..what could it be? 25 weeks

Since like 7pm last night (3/19) I've had this pain sitting right where my hand it. It's like on the left side of my back and all the way to the side. My hand is placed like right above my hip, like you know where the skinniest part is. Last night it was on both sides but the right side went away about midnight but the left side has stayed hurting all night and into right now. It doesn't hurt when I breathe or anything. I don't think I'm dehydrated. I've been having regular bowels. I have no idea what it could be.

I'm 25 weeks.

Anyone else have pain like this/know what it could be?