I'm leaking..

I can't tell if it's urine, cervical fluid, or amniotic fluid. It started last night it's not a lot but noticeable when it dribbles out. I didn't smell anything on my panty liner but it looked almost light yellow. It's happening whether I've just peed or not. Doc appt on Friday. I remember having leaking with my first at 36+6 (cervical fluid) but I'm only 33+6 today. Guess I'll find out Friday.