you ovulation isn't based on your menstruation, your menstruation is based on your ovulation. if you had your period late, it's because you ovulated late. you can 'expect' your ovulation to happen about 14 days after the first day of your last period (LMP) - but that's more of a guide. learn your body cues to know when you are ovulating, and use the calendar for back up and a time to watch more closely. when you know when you ovulate, you will know when to expect your next period.
at 6:22 PM on Apr. 30, 2009