TMI but here it goes

Pia • Miscarriage with my 4th, trying to conceive baby number 5. Finally pregnant with my 5th 🌈
Right now I'm 13dpo. AF is supposed to start tomorrow. When I was about 9dpo I had some CM with what looked like blood in it come out of me when I was using the restroom. It wasn't a lot and that's the only time I had it. I usually get cramps and other symptoms before AF arrives but I've had none since the incident I mentioned. Has anyone else experienced anything like this and if so what was the reasoning???