WTF is this?!

So, I'm 6 days away from my period. Yesterday I had some pretty heavy fatigue and back ache, but just decided to go to bed to rest. Not really thinking anything of it. This morning I woke up, went to the bathroom, and when I wiped the paper was smeared with a brownish blood?... discharge? I'm not sure. No blood in the toilet, but just every time I wiped it was smeared with dark brown. It didn't look like any kind of mucus or anything, just brown blood. 2nd time I went to the restroom for the day, same thing. The 3rd time I went to the restroom, it was gone.

I've never once had this, so I'm not sure. I'd immediately think implantation, and actually did at first, but I've always had to take treatments to get pregnant, and I'm not... and we only had sex 4 times this past month. Seems unlikely to get pregnant, with infertility, while having such little action lol. 🤔

Anyone else have experience with brown spotting a week before their period? What was it?