How long after your fertile window do you have "egg white" cm?

Morgan • I have a son born on Dec '15, another son who was born Sept ‘17, and an angel baby born into heaven Nov '14. 💓
Today I got the BBT raise that indicated that my fertile window is over for this month, so why am I still having "egg white" cm? Does it just take a few days to clear up or is it supposed to be gone by now? Sorry! TTC newbie so I'm not sure what to expect. Thanks in advance!