What are my chances

I've been having some spotting for the last three days it was light pink to start with and is now brown, it hasn't been transfering onto my underwear but last night I thought I'd wear a tampon incase af was going to show and nothing was not that either, could this be implantation? I only came of the pill a month ago! So not sure what to expect

Also when is the best time to test?

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