Pulling/tugging in lower uterus. (19 wks, 3 days)

Hey ladies, first off I'm sorry I feel like I post in here a lot. So just today in the past couple of hours things have gotten weird for me. I suddenly have to pee a LOT. Like get up and 4 minutes later walk back in just for a few dribbles. And I've noticed a heavy pulling sensation/tugging coming from my lower uterus, even just standing it does it. No severe pain or bleeding. It started about 2 hours after we left the beach. Should I be concerned??