When did Braxton hicks start for you and what did they feel like?

Li
I'm 21 weeks and 5 days. 
My pelvis area has been sore for days and have gotten worse (still tolerable) but today my similar pains seem to be accompanied by very light barley there cramping is this the start of Braxton hicks or just baby beating up my uterus with its fish flopping and kicking 

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