What could this be?!? UPDATE

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So I have never had this type of CM (as far as I can remember). AF is due in 4 days, but I’m hoping she won’t show.

What do you guys think? Is it an early sign of her or could this be pregnancy related?

Update: after it looking like this for one day my CM went back to clear. Took two tests on different evenings but negative. I’m wondering why it went from this color back to clear. Possible pregnancy?