The same happened to me with my first. I had a slow leak, turned out my water had broke and I was already dilated to 5cm at 35 weeks. Go to your Dr asap.
Update? I hope you went in to get checked
Go to l&d they can test it and see if it's ur water or not!
Sounds like a slow leak! I would call my dr & go in
Your water broke maybe. I would call the dr asap