Get checked ,same happend to me at eight weeks baby had stopped growing at six weeks , unfortunatly misscaride,best of luck x
I had the same issue and it was my body adjusting for the baby. Mine lasted on and off for a few days but has now stopped. I understand,. I panicked I cried I went to ER and they gave two ultrasounds but everything is good. Good luck.
I'd call the dr. Maybe they can get you in for a check up.