Could this be implantation?

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I am about 7 dpo and not due for AF to 6/14, suddenly having dark mucus. Not a lot (contained by panty liner), but I was expecting implantation bleeding to be lighter and pinker. I can't think of what else it could be though. I had a positive OPK last Sun and my cycles are always regular. Anyone know if this is normal? I had a chemical last month so I'm fearing the worst. 😢

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