I don't trust any of those retrospective calendars because you never know 1) how close your were born to your actual due date and 2) unless your mother was charting, she wouldn't know her actual date of ovulation/conception anyway. My Mom tried for YEARS to get pg with me - I doubt she had regular cycles. I mean, I just ovulated 11 days late - that's a big difference when you're talking moon phases.
BUT... for fun... *if* my due date was correct and I was conceived on a 28 day cycle w/ovulation on day 14, then I was conceived just after a full moon.