Could this be implantation bleeding?

So me & my fiancé have been ttc for a while . Now I've been having on & off brown cm. But no period? Is this a sign of implantation or just the start of my period. I would love to hear your advice ! this is the second time I've seen dark/light brown cm in the past three days. It's very scanty and doesn't get heavier. I do have a little bit of cramps

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