Fair play to op for his experiences and his preferences
Don't think this will have happened to just me and probably more have experienced something similar.
Have met with an regular a few times and undoubtedly when she was closer to her period the hornier she is and definitely better experience. The only thing is sometimes can be too close and for me have experienced the blood during RO and never noticed until the RO started.
I did not notice this during a light bought of finger play/ foreplay.
Was it off putting? For me no and never really noticed huge difference to be honest, ok apart from a little blood to face after the RO but not like a slaughterhouse.
It's not something I actively pursue or request/requested but wasn't to bad to be honest. Only thing I can add from my own perspective as when meeting any SP, I always go for regular health checks anyway and when this occurred, I booked in a little earlier than my scheduled testing.