If it makes you ladies feel any better, I had a scan on CD12 that showed a bunch of tiny follicles, and only one at 12mm. But I had super high estrogen, so the doc told me that the tech most likely just missed the mature follicle in there because something was ready to pop with high estrogen. And then I promptly got a positive OPK last night at CD14. In other words, the scan made no difference in the end, as it was wrong, and I'm currently ovulating anyway....