Could my cramps be implantation?

I am 7dpo and cd21. I typically have a 28 day cycle. Today I am experiencing mild cramps in my lower back. I have been for a few hours. My period is expected around 1/9

I’ve had two chemical pregnancies and for both I had cramps around this time and a few days later I tested positive with a hpt

I’m not trying to symptom spot. I just want to know why my lower back is aching

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