Cramping feeling for almost a week now :(

Jessica
So I've had this odd cramping feeling for about a week now and it happens mainly at night after I wake up and walk around to go pee then go back to bed, or in the evening just sitting around. It's almost like a burning feeling or a feeling like I have to go to the bathroom in a way but I don't....
I went to the er for it a few days ago and they did a ultrasound and everything looked great and the baby looks fine.
I'm 11 weeks 5 days. 
Anyone else go through this??? I'm not having any bleeding with it. I'm just wondering when this pain will go away because it stresses me out... I'm assuming it's round ligament pain but didn't have this with my daughter.