Really really faint line on pregnancy test... Am I pregnant?

I don't know if I'm pregnant I took a pregnancy test about 2-3 days ago and it came up with a very very faint line but could that mean it's just the test playing up or could that mean I'm pregnant I used a first vue test I've used them before and they've always come up very clearly with only one line and this time it came up one very clear bold line and one extremely faint line. Somebody help me please.