Amniotic fluid or urine?

Okay, so about 6 hours ago i went to the hospital because i thought my water had broken because i had been experiencing leaking all day long. They did a test with a nitrazine paper and said that it was not amniotic fluid so they let me go home. I had not felt the leaking until a few minutes ago and it came out in a big gush so i went to the bathroom and it kept coming out. I'm not sure if i'm overreacting and just thinking the nurses at the hospital are wrong or if they really are wrong. Is it possible that it's just urine? Has anyone else had this happen to them? I'm 35 weeks, 3 days.