When to test after possible implantation bleed?

[highhopeslowreality]

Right, I dont know why I'm posting this as the chance of it an actual implantation bleed is less than zero but I'm driving myself crazy.
Backstory of pcos and infertility treatments, no period for about 6 months (normally have every one every 3-4.)
For the past three weeks I've had that pmt feeling - achy back, moody cramps, but nothing came of it.
Last Thursday I after using the loo I wipe and have pinky/brown cm and think that I'm coming on. Since then nothing, nada, zip. Ive done about 3 tests on on the 3rd I swear I could see a faint, faint line but I dont know if just seeing things after being in Dr Google's grasp for the last week.
So I need a straight talking to on the chances of this being a implantation bleed or (as I know deep down) just my pcos playing about.

Sorry for the long post

When are u due af? It could just be u need to wait til af or after it. I've heard some people don't get a bfp til 3 wks after!

Thanks for replying babyrose
The problem is that I dont know when af is due at all, its all a bit hit and miss
I don't know what I want the answer to be either, I still feel pmt-y and I just want to know either way I guess.

Sorry for rambling.

After implantation, hcg is usually detectable 2-3 days later with a sensitive test, such as the superdrugs ones. HCG doubles every 2-3 days, so try again in a few days, good luck!