7DPO Implantation Bleeding?

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Is it possible to have implantation bleeding at 7DPO? Husband and I BD on 1DPO (according to Glow) with Pre-Seed, AF shouldn't come for another week. I just went to the bathroom and found some brown coloring when I wiped. I've gotten AF late, but never early. Fingers crossed! 🙌

Just wanted to get some opinions/experiences.