Soaked underware at 36 weeks??

I put a fresh new pair of underwear on about 2 hours ago and when I went to the bathroom they were wet, like I leaked a little. A big wet spot. No odor. But I literally felt nothing. Has anyone else had this?? It isn't my waters is it?? I haven't had any contractions that I know of and no bloody show. But I've lost some of my mucous plug.