Pregnancy test faint line

[Justherehoping]

My period is due in 4 days but for the past few days I’ve had a metallic taste in my mouth and the worst mood swings ever. lI’ve done a clearblue early pregnancy test this morning and didn’t see anything but this extremely faint line appeared. Is this an evaporation line? Thanks

Yes, if it came up outside of the time I'd say it's almost certainly an evap line. Doesn't mean you're not pregnant though, just that this test hasn't detected it.