Implantation bleeding

Hi all

ive just had a 2 to 3 day period much much lighter and at times brown .
Im hoping to hear other mums experiences on implantation bleeding I had a mc a few months ago and never had anything like this with my 2 kids ...
Not sure if it possibly could be implantation bleeding or just nothing and some wishful thinking.
And how long after did u test positive (dont want to waste money if it wont show up for another week)
TIA IM's