FWIW, I'm 33 and DD2 is 29 months and basically weaned (she latches on a time or two a day for less than 60 seconds total), so I don't think it's perimenopause or breastfeeding related.
Is this a progesterone thing? Other thoughts?
It could be a progesterone thing. Mine was low and I typically have spotting for a few days before AF. I do acupuncture, and I started taking some B6 last month. I had 2 days of a little spotting and then none the next. I was pretty excited about that one day without. I would like to credit the B6, but I can't say for sure.
I don't know what would cause it, but my cycle has been like that since about 2007. I had no issues getting pregnant with my son and I just accept it as my normal cycle. I am 27 now.
I believe it's called a luteal phase defect, so yes, I believe it is a progesterone issue. Try supplementing with some B6 and see if that helps it.
50-100 mg of B6 and best taken with a B complex or multivitamin that contains the Bs. From what I've read, you need to take at least 50mg of B6 to help with correcting luteal phase defect.