October 20th, 2006, 06:52 PM
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Platinum Supermommy
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Join Date: Aug 2006
Location: Alberta, Canada
Posts: 10,163
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The only way to know the EXACT day that ovulation occurs is to have daily transvaginal ultrasounds and blood draws.
So keep in mind that charting simply gives us an estimate of when it happens - a very good estimate, accurate within +/- 2 days, but still an estimate.
Ovulation usually follows a +OPK by 12-48hours. An OPK simply tells you that your body is trying to ovulate, but is not a guarantee that you will. It's possible to have a positive OPK and not ovulate after all.
Basal body temperatures rise in response to progesterone, which is produced after ovulation happens. Sometimes it can take an extra day or two for temperatures to respond to the production of progesterone by rising, so you can't always assume that ovulation happened the day before the thermal shift - it may not have.
Cervical mucus is your most accurate reference in terms of detecting ovulation. Ovulation usually occurs closest (on or within a day or two) to the LAST day of slippery mucus, before there is a drastic drying up.
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