What on earth is this?!!! Evap?!

Liz

Had bloods drawn last week as I was getting bfps on frer, Clear Blue and internet cheapies, 6 weeks on from D&C and after getting negatives.

Bloods told a 5 was positive, then when they called, my bloods were 9, and they said they class 10 as positive, so negative test.

Today I got this (7 weeks from D&C and a week on from bloods) on a 25ml test! I was just checking it was a bfn! Is this an evap? It’s super faint...