Evaporation line or faint positive?

So according to my period tracker I was due on a week ago today. I used a pregnancy test strip around three days after I was due on, I don't know of it was a evaporation line or a very faint positive, I only left the test five minutes before looking.
I have retested this morning and I feel the second line is still very faint, I thought it would be stronger especially now being a week late.