Please help...Peeing so much

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I am currently 26+7 and have felt so dehydrated the last few days. I have been drinking water constantly. I go to the bathroom every 15-30 mins and its clear. This is baby #2 and every time I sneeze i pee a little also (I have major allergies), so its every hour or so. I had my gestational diabetes test last week and all numbers well in range. Im not diabetic and have no major issues last pregnancy or this one so far. He is very very low in my uterus for sure though. Any ideas why i am peeing clear and so often??