amniotic fluid or wet discharge????

isn't it amniotic fluid when it's constant and steady? I have wetness but it happens then I wipe, no color no oder, then won't happen for awhile then when it does it's the same thing. I don't get it when I sit or sleep either, before pregnancy I always had heavy vaginal discharge but usually creamy or stretchy normal stuff. but I'm pregnant now so I don't know the norm. currently 28 weeks