Could be Braxton Hicks. I never knew what they were until my IM pointed out I was having them. Didn't hurt, just felt tight sometimes, then not. Totally normal.
That used to happen to me too, bubs still has alot of room to move around so it feels less hard when they arent right up against the front. At about 27 weeks, The whole lot stayed hard all the time for me, and that is when I rapidly started popping out.
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