Vfl or evap?

Emily

I was put on metformin about 5 weeks ago but haven’t had a period in 4 years so I’m not sure when I ovulate. I did a test yesterday and a faint line appeared and then the same happened this morning. But I’m not sure if it is actually a really faint line or an evap line? What does everyone think? The top picture is this mornings test and bottom is yesterday’s.