Girls, hello. Gestation is 18 weeks, sorry for the details, I have su…

Girls, hello. Gestation is 18 weeks, sorry for the details, I have such an impression that something is leaking from the vagina, not discharge but more liquid like water in small amounts. I change pads daily, there's cotton collecting from moisture. There are no pains. I am going to the doctor on the 21st. This is my first pregnancy, maybe it seems so? What could this be?