Pelvic pain/ache..

Ca

I'm 18+2 and the last two days I've had this achy feeling in my pelvic area. It's not too terribly uncomfortable and it comes and goes. If it continues into tomorrow, should I call my OB? I haven't been drinking water like I should, jump my ass I need it😩 could that cause the achy feeling? Or is it just baby girl growing and everything stretching? I'm not bleeding and the pain isn't uncomfortable it's just annoying lol..