first ever possible bfp? evaporation line? please help!

Mia
I have just this second taken a first response test - I am 3 days from my next period and I know I should do the test first thing in the morning when testing early but I couldn't wait any longer. This is the best photo I could get and trust me I had to take about 15 photos and it took me ages to get it in the right light - is this a positive test or could it be what I've heard as a evaporation  line - I've never had a positive test so I'm not sure! Please help! 

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