Am I leaking amniotic fluid???

Megan
I had to once before about a week ago but now today kind of worrying about it.
I had to change my underwear, I feel like I leaked but doesn't smell like urine, I wonder if my water broke a little and it's leaking? It went through my panty liner through underwear and even sides of underwear. Didn't trickle down my leg necessarily but just seemed not usual! I know they test for seeing if that's what it is but how do they? Anyone know what could be going on? I'm 37 weeks. I appreciate input!