Evap line? Clear blue tests turn positive outside window?

Hi, my OTD is Friday 1st March but we caved and did a test today (11dp5dt) These both were taken on 7dpt and 11dpt, but the second line only appeared when I checked back later. Is this an evap line? Are clear blue notorious for doing this, negative then turn positive? Any advice would be appreciated. Thanks 🙏

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Really sorry, I wouldn’t trust them simply based on my experiences. I stopped using clear blue and switched to cheap Poundland tests after this caused too much upset. Really hope there’s something there properly for you when you test in the next couple of days xxxxx

I would say to wait till your otd and then test to get most reliable results, also use first response that will give you a clear answer by then, all the best x

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