Mild period like cramps

I’m 36 weeks and 4 days. For the past few days I’ve been getting period like cramps which are very dull and in my low abdomen. They don’t hurt necessarily. It just feels like I’m about to get my period or have PMS if that makes sense. Did anyone else have this? What does this mean? At my last appt doctor had done a cervical check and said I wasn’t dilated yet.