The faintest line known to man or woman

1) merry Christmas!

2) I did a test although only 10 DPO as I really was hoping to get that BFP to surprise my partner with. I did this with first morning urine around 6:00, never got a positive or even the faintest line. Got back into bed and didn’t expect to see anything, used my torch on my phone and I see a SUPER FAINT line, or maybe it’s nothing, or an indent. It’s clearer in real life but I’ve got the best photo I could. Should I test again later so I can surprise him and ensure I don’t drink today? Or just wait till tomorrow/AF is due? Thanks!

Update: tested again with a digital and got a positive 😊