Probably Braxton Hicks, I never got them with my first or second but my third I had them in 3rd trimester my 4th they started at around 16 weeks.

Sounds like braxton hicks contraction almost. They can start as early as 6 weeks but you don't typically feel them until the 2nd/3rd trimester. Ive been having them alot here lately along with round ligament pains and good ole lightning crotch. 😂