Hi fellow glow members

I'm a little confused at the moment, me and my OH have been TTC for just over 12 months, I have just had my period, and before my period last month I took and early pregnancy test, a first response one, the result was negative at the time but for some reason now it has a very faint line??... I know I'm not pregnant because iv taken another this month as my period was 2 days late and that result was also negative,..

I'm just wondering if anyone can shed some light on the faint line from the test I did last month... This has confused me slightly.

Any feedback would be great..

Sending baby dust to you all. Xxx