Round ligament pain or something else?

Bella

I’m 21 weeks with my first. This afternoon I started having cramps. Similar to my period cramps. They’re in my low back, hips and lower abdomen. It’s not sharp but very uncomfortable. It started at work around 415pm and has gotten worse. I had something similar in the first trimester too but this time it’s more painful. Is this just round ligament pain/pain from the uterus expanding?