Question about CM

Alex • Aspiring personal trainer, and highly active person. Want children in the future, and nanny as a second job.
I read that to get to your CM to check it you need to stick a finger around your cervix. And use whatever shtuff comes out to track.
Im just making sure that there is a difference between CM and the sticky clear vaginal fluid, which i would describe as "egg white" because im trying to track everything in this app for when i do go ttc.