10dpo??? Help please

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Could 10dpo still be too early for a BFP? I had very light pink CM at 8dpo and very faintly again this morning at 10dpo. Could this still be implantation spotting? AF expected in 4 days on 12/20.

Tested this morning and it was BFN. Could it still be too early? The pink cervical mucus isn’t like any pre period spotting I’ve ever had.