When to test?

I've had what may be implantation bleeding since yesterday. Seemed a bit much at first but tapered off quickly. Was generally light pink and brown, so I believe I got the criteria.

I'm 10 DPO today. Test this morning was negative but since implantation may have just taken place yesterday, how long roughly until I would likely see a positive of there is one?

I bought three FRER's but want to try and hold off on those till one of my tiny strips comes back! With a VFL, unless you all think the FRER test would be a better option? I have MomMed and easy@home strips too.