is it normal?

im 31 weeks 2 days. these past couple of days I've badly constipated it feels like im completely blocked and sneezing thinking my water broke but was just pee i think. is this normal or is my body ready. my last pregnancy was 35w5d had to be born early because of low amniotic fluid.

also, i have my appointment in the morning tomorrow but i just don't want to be shocked again if my dr tells me i have to go to the hospital