I tested early and got a dark line and I was 13DPO I would probably get at least a light one if I tested earlier than that...I hope its implantation for you... I had brown spotting too like around my pregnancy and it might be old blood passing out from the implantation that happened earlier.. either way I rested to make sure..
good luck to you :0) all the best.. sticky baby dust :0)
If you are pretty sure it is AF then why do you want to test and waste a stick. Instead I would save it for next cycle. If not, and you suspect it might be implantation, then I would wait couple more days to test. Because in that case it might be early to find enough hCG to get a BFP.
Either ways I recommend you to wait for couple more days to test. Wish you SSBD.
You can test then, I tested at 10PIUI on our second try and got a +, although it was very very faint. However, if you get a - it could be false, it depends on when implantation occurred.
Maybe your spotting is implantation, perhaps...maybe you implanted later???
Good luck!