I get them while I get Braxton hicks at the same time so my belly would be hard and getting pains at the same time it's weird.
I was having the same thing and my doc said it was Braxton hicks. I didn't have them at all with my first so I didn't know what they felt like. They told me to just drink alot of water cuz it could be a sign of slight dehydration.
Im 37weeks today too and iv had these period like cramps for 5-6days now..my doctor said its normal..its our uterus getting ready for labor..I never experienced this my last pregnancy either