thoughts please! 4 days late milky white cm

i was having irregular cycles but the last 2 have gone back to 33 days. this month i didnt use the ovulation tests be cause i knew what days i was fertile goimg off last 2 months and cm etc. I am now meant to be 4 days late, got a bfn this morning and my cervix has been very high soft and closed with milky white discharge. now im confused am im ovulating late or is this a pregnancy sign?

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