Implantation spotting ?? 😵‍💫

Today I would be 9dpo assuming I ovulated cd18 because I got my peak cd17. I’ve been cramping since last week & today they were a bit more intense as if Aunt Flo was about to start & when I when to pee I noticed I’m spotting brown. I’m on cd 27 has anyone had implantation bleeding what was your experience ?