17 Weeks And Cramping Only on my Right Side

A

I’m 17 weeks pregnant and I’ve had painful cramping just on my right side. My baby lays on my left side. It’s not so bad that i can’t function, and there’s no blood. I went to the ER a few days ago and did an ultrasound and they said they couldn’t find anything and it was probably round ligament pain. This does NOT feel like round ligament pain. What could it be? I’m really worried 😥