Feeling tightening/cramping pains in my pelvis/uterus 38+4 weeks

mommy kiins

I was in B&M shopping when i suddenly stopped and felt a cramping feeling in my left side of my pelvis area it was painful felt like i pulled a muscle. This kept happening would stop and start then when i got home and sat down the pain eased off. Lil mans been moving so much i wasn’t sure if i was in early labour or his just bruising me up in there. Has anybody else experienced this feeling before I’m 38+4 weeks.