one step ovulation tests

Hannah
Hi girlies. Has anyone used these? If so, thoughts?  
I was showing high fertility (on the clearblue with the flashing smiley) and then I ran out of sticks so went on to these. My line seems to be getting fainter. It's really light anyway but getting paler each day!
I normally have clear ovulation symptoms (ewcm and cramps) and according to temp I haven't ovulated yet this cycle. So why are they getting paler instead of darker?
Many thanks
Xxx

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