I agree, I see something very very faint on that test. It could be an evap, but my early positive tests did the same thing. I couldn't really see anything in the timeframe, but I looked at them after they were dry and there were lines. The previous tests had no lines whatsoever when dried.
BTW, those tests were FRER from 13 and 15 dpo. I looked at them on 16 dpo late in the evening and was shocked to see lines! Sure enough, when I tested the next morning on 17 dpo with FMU, BFP! Fx the same will happen for you, and you're definitely not out!