I agree that you should get it checked out Sarah.

I had the exact same thing happen to me... and then a few hours later my waters full on broke and gushed everywhere! (luckily I was at home at the time!)
From what you are saying it doesnt sound like urine at all... Does it smell like ammonia or bleach or something, cause if so then it is pretty likely to be amniotic fluid.

Good luck tomorrow, I will be thinking of you!!