Hi Honeybean,
I start to take mine on the 1st of the month. This way I can remember - well most months, I remember! Then I take two capsules (200mg) for 12 days and the withdrawal bleed starts fairly predictably mid-month, each month. I've been doing this for over a year and I'm really happy with the regularity of the bleeding, and no spotting or bleeding in between.
I'm beginning to wonder whether I should change to daily dosing as I will be 56 years old next month and likely post-menopausal. However, that's a whole other question.