5/6 DPO dark OPK?!

[ashleyg]

So I think I'm about 5/6DPO going back over my Ovia app. I took an opk just because and it came up really dark?! AF isn't due for 2 more weeks and usually my OPKs are pretty much invisible this far out from my period.

Anyone have any idea?

 

[ashleyg]

Another picture after it dried it a little

 

[pjmm]

Hi! I've read opk intensity is kind of random after O for every woman. Had you ever done OPK after O before?