Ummmmmm help!?

Kaykay • Marine wife, 3 fur babies, and a whole lot of Love 💕
Idk if im fertile or what right now
I checked my CM and its slippery when i rub my fingers, and on the back ride of my finger i saw a little goup and tried to stretch it, its stretched like half a centimeter..
Husband came in me yesterday
He checked my CM earlier today said it was slippery and wet
His finger looked slippery too litttle pieces of white? 
Please help.
Period 18-25
First two days very very light pink
Took HPT yesterday and it said negative