Hello everyone Does anybody know why a women like me at 38 1/2 weeks know why clear fluid is coming…

Hello everyone Does anybody know why a women like me at 38 1/2 weeks know why clear fluid is coming out of the Virgina? I told my doctor on Friday and had a ultrasound done they said the baby is not breeched and there is 17 I guess % of fluid still in me but 2cm dilated ? but yet I didn't pee on my self cause women would know if and where pee comes from.