yes exactly - especially since people didn't even know how to pinpoint ovulation (or even that ovulation even HAPPENED) until very recently in human history.

Studies have shown that with even a high level of training and technology (charting and thermometers) that people can't pinpoint the day of ovulation any better than sheer random chance. People say "Shettles worked for me" because they THINK they know when they Oed, but they don't. Even with a pretty regular cycle, you cannot know without an ultrasound when you ovulated.

Prenatals alone for blue have gotten good results for us so if you're taking in more nutrients, you're in with a good chance of blue.