17 weeks lower ab discomfort

Christina • Got my BFP Thanksgiving eve 2014 !!! Pregnant with our first!!💗💙Due in August
So I'm 17 weeks + 2 and once in a while usually in the morning I feel mild cramps or discomfort. I've read it may be from my uterus stretching but I've also read it could be Braxton hicks. Can anyone relate? Super nervous.