Has this happen to anyone?

Alyssa • Husband and I have been TTC for 2 years! I’ve have my left ovary and tube removed due to large mass! Had laparoscopy done to remove mass on my right ovary, Hopefully 2018 is our year!

So AF was suppose to come 12/7 but came 12/9.

I had no warning AF was coming. Usually I cramp 3 days before and my breast get sore but nothing. So it came 12/9, I had some intense cramps and the color was a dark dark red and brown ... not usual. And it only lasted 1 day. When I place the Tampon in, it’s nothing in there after. But when I wipe there is a little spotting. Buts that’s all. Has anyone has this happen? What could cause it?