10 DPO and OPK Darkening?

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Hello!

I am 10 DPO CD 26 and I took a HPT yesterday and it was negative but my OPK see below is starting to darken.

Is this normal before AF?

I've had dark OPK before positive HPT this year (2 losses:() but they were 11 DPO and 17 DPO respectively and the 11 DPO was a very faint positive pregnancy test.

Thank you! And please keep your fingers crossed for a positive HPT and healthy pregnancy!