PLEASE help! Implantation bleeding (no pics)...I've been asking this question all day and no one responds 😞

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My period comes every 5 weeks. I'm 13 DPO. 1 week away from my expected period. 
Last week (6 DPO) 
I started experiencing period-like cramping but much less severe. Just annoying. And been having them off and on since then.
Two days ago (11 DPO) 
I had pink blood twice then nothing yesterday (12 DPO).
Today (13 DPO)
I started spitting again. This time with brown/pink blood and even a little light red.
Took a test today and got a negative. Could I still be pregnant? Does this sound like implantation bleeding/cramping? Please...I'm desperate for answers...

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