What is that white cervical mucous?

Fingered deep inside of my vagina and got a little white string. It looked like peeled dried up Elmer glued but wet and texture is exactly like the peeled Elmer dried up glue....

I am not pregnant, right?

And my period is in a week from today!

I last time I had sex was June 4th a day after my period ended... but my period was light... and I did had multiple sex in May. They all were protected sex AND pulled out before cum.