I had about three or four days of pre-AF spotting for several years, and believed (from reading the internet) that I might have a progesterone deficiency.
I finally went to the doctor about it last December.
The doctor did a trans-vag ultrasound and saw that my uterine lining was a bit overly thick for where I was in my cycle.
She decided to do a D&C and another procedure where they look inside your uterus with a tiny camera, I can't remember the name of it.
It was day surgery, but I was put to sleep for it (for the first time ever. It was scary, but it wasn't nearly as bad as I imagined).
Anyway, it turned out I had an endometrial polyp, which was benign. The doctor removed it during the D&C, and told me that was what had been causing the pre-AF bleeding! The polyp, responding to my hormones, would actually start to bleed several days before AF came.
Weird, huh?
After the polyp was removed, I never had pre-AF spotting again.
Anyway, it was nice to know I was healthy and had no hormonal problems.
I got pregnant two months later, in February.
I don't think the polyp would've prevented me from getting pregnant, but on the other hand, having a D&C and getting all cleaned out may have helped.
Who knows?