super wet??

I'm 40 weeks pregnant tomorrow... the past week I'd say my discharge has been like water. It wets through my pants. I went to the dr on Thursday and it wasn't my water but now it just keeps seeming to increase. Tonight I finally got tired of it and bought a pack of pads. I constantly feel wet and gross down there no matter how much I change my underwear. Is this normal or could it be my water leaking slowly?