OPK strip like this??

So I know your not supposed to use OPKs after ovulation, but I did lol. But now confused as to why it’s this dark on cycle day 27 12DPO? Do they go like this before AF?

Also had spotting 10DPO and 11DPO and now on 12DPO it’s gone like a yellow colour, I have no infections etc. AF due tomorrow or Thursday did a PT yesterday and was negative. Thanks for any input.

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