Measuring small

I'm 35w4d and my Doc says I'm measuring 2 wks behind. I have been growing, but in the last 3-4 wks it has been slowing so I'm having an US done tomorrow just to check that everything is fine and possibly low fluid.. She is head down and lower in my pelvis now. anyone else have this experience and can put my mind at ease? I've had an incredibly easy pregnancy so far, she moves every day and otherwise no complications at all. I have noticed that I have clear discharge (or so what I thought was discharge) every day but thought that was normal so didn't think twice...