11days late but on the pill

Started on a new pill 2 months ago and I'm now on the mini pill. My period would have been 11days ago but didn't come. Thought the pill had stopped it as I was told this could happen. Anyway fast forward to now and out of curiosity I've taken a test and this has come up. Is it a faint line or evap? Pic taken straight away. Can be seen in some lights but not others

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