Girls, help me!!! I'm at week 24, today after a run I went to the bat…

Girls, help me!!! I'm at week 24, today after a run I went to the bathroom three times, like I haven't peed in ages, not yellow, not smelly, my belly became hard and solid once, what could it be?? The baby is moving all normal, it was a little sore in the lower abdomen from the left side.