Implantation bleeding or period?

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12 DPO. AF is due in 2 days. Over the past week or so Ive been feeling dull pains in my pelvic area, heavy boobs/

sensitive to touch boobs, I even had heart burn for a couple hours and I never get heart burn.! 8DPO I took a test it was negative. Do y’all ladies think this is AF coming or IB?