Implantation Bleeding?

I’ve just gone to the bathroom and noticed after I wiped that there is a pinkish tint to my discharge. When I wiped my underwear it was light brown almost like dry blood. My period is due in 5/6 days. I’ve been getting cramps to the point where I’ve taken paracetamol to ease it and this is odd but my knees are really aching. The side of my boobs hurt and I have a mild back ache.

I’ve added below the picture of the discharge (SORRY FOR TMI) and also a screenshot of my flo app. All the days with the heart were unprotected.

I’ve never experienced implantation bleeding before so I’m not sure what it looks like or if it’s the right time to be seeing it.