Negative ovulation test but fertile cm?

Lily • Pregnant with baby #4

I’m supposed to ovulate in 2 days and today started having a lot of egg white stretchy cm but all of the ovulation tests I’ve taken are negative (I take two a day everyday)

I’ve had 3 children already and monitored all of this with my last two so I know what positive and negative ovulation tests look like and what my cm is supposed to look like but I’m just so confused this time around.

Has anyone else experienced this? Negative ovulation test but fertile cm??