Period is 75 days late...just got light spotting..

Alyssa
Hoping for some insight..
My period is 75 days late and I am currently being tested for PCOS. Tonight after peeing I noticed a light pink discharge on the toilet paper. 
I'm freaking out. For the past 75 days I've had so many pregnancy tests, ultra sounds, cat scans, and blood work done and pregnancy was negative for everything. 
Could this be my body trying to get a period or do you think it could be something else, like implantation bleeding?
I go to the GYN Monday for another follow up but until then I am wondering what everyone's thoughts are!!

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