Bleeding 7dpo, what is going on?😣

I started the day (cycle day 22, 7dpo) bleeding and it went from medium-heavy to zero in 6 hours. First red, then dark red, pink, brown and finally disappeared. It can not be my period since its a week early and I don't feel any other symptoms at all. I had a bit of fever yesterday but also fade out in the afternoon. I am taking hormones for my hypothyroidism. Any similar experiences? Can the hormones be related? Thank you in advance!