As a bit of an intro, here is my background info:
* I have a heavy flow 99% of the time, but not so heavy that I soak through a pad every 2 hours
* I am not on any kind of birth control, but I am not sexually active.
* 99% of the time, I begin with a heavy red flow that fades in color and heaviness over 5 days or so.
* I generally do not have menstrual problems. I will occasionally have one that is late or absent, but usually not.
* Some months, my cramping is worse than other months, but it doesn't interrupt my life.

So my most recent flow began two days ago with very mild cramping. On both of those days, the blood was unusual. It was as heavy as it always is, but this time it's been dark brown to almost-black.

A quick Google search returned little, but one website said that it may be because of a light flow, or because you're a slow bleeder.

But the problem with that is that I am just as heavy as I always am, and this has never happened before. This is a new occurrence, so if I was always a slow bleeder, this would be normal for me.

And I don't think it's a clot. because clots tend to be a certain size. Women are able to describe it as "dime-sized," or "baseball-sized," or something like that. But this blood isn't a size. It's like a weird, messy, smearing of thick . . . stuff. It almost looks like black peanut butter or something.

I'm not sure if I'm making any sense, and maybe I'm worried over nothing. But can anyone relate?