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Oh I've learned so many myths that I never realized. Like this one:

A woman can get pregnant only one day per cycle.

While it is true that a human egg is only viable for 12 to 24 hours, a woman can actually get pregnant from an act of intercourse occurring anytime from about five days prior to ovulation to even occasionally two days after, for a total of about seven days.

The reason for this is that the sperm can survive up to five days inside the woman's reproductive tract, and a woman can release two or more eggs within a 24 hour period.. Hence, for all intents and purposes, a women can get pregnant for about one week per cycle.

and to add to the ovulation myths:

Ovulation usually occurs on Day 14 of the cycle.

Probably the most widely held fertility myth is the notion that women always ovulate on Day 14 of their cycle. If this were indeed true, there would be virtually no need for birth control, since couples could simply avoid that one day. And scores of couples desiring a child would simply have intercourse on Day 14, and Bingo, get pregnant.

There are several serious consequences to the Day 14 fallacy:

Many unplanned pregnancies occur because couples think they are safe for unprotected intercourse on any day but Day 14.
Many couples who desire to get pregnant actually impede pregnancy by timing intercourse on Day 14, when, in reality, the woman may ovulate either much earlier or later than that one particular day.
Many diagnostic tests and therapies are performed at an inappropriate time in the woman's cycle. These include infertility procedures such as post-coital tests and endometrial biopsies, as well as general health procedures such as mammograms and diaphragm fittings.
If a woman does get pregnant, the doctor's office will usually utilize a "pregnancy wheel" to determine her due date. But this device assumes that women ovulate on Day 14, and therefore could be off by several weeks, leading physicians to perform diagnostic tests at inappropriate times (e.g. amniocentesis) or even induce labor before the baby is fully developed.

The only thing I may disagree with regarding the CM charting vs the temp charting is that last month we BDed based on the CM - or what *I* thought was my most fertile CM. Turns out I ovulated later than the EWCM appeared for me. Hence me picking up a thermometer for this month.

There are more myths at: http://www.tcoyf.com/library/myths.asp#1
 
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