what is this?? white small pieces?

jess • •24• •class of '18• 🎓🤘🏼 an I go on this app to keep w my sex life and other girly things! 🌸💃
I been like this couple of days, and im wet down their and when I put my finger instead my vagina, I get this wet and Lil white pieces/chunks? (im about to start my period next week)