Belly feels hard but I don’t think it’s BH

I’m 26wks. My belly has been feeling really hard all night. I’m not sure if it’s Braxton Hicks because I never actually feel them. I can just tell they’re BH because my tummy gets tight but it goes away quickly.

Tonight it’s been consistently hard but I don’t think it’s BH. I’ve been drinking plenty of water and am well rested (things I know that can trigger BH).

What can it be? I’m thinking baby’s position?