Charting Basics
If you are a nerd at heart and love data, you will love charting. It
involves taking your Basal Body Temperature (BBT) every morning
and recording it on a graph. These temperatures will show you when
and if you ovulate every month.

Take your BBT every morning with a BBT Thermometer. Try to take it
at the same time, and after you have gotten at least 3 hours of
uninterrupted sleep.  You can make your own charts, or you can use
online software such as
Fertility Friend.

A typical pattern of a cycle begins with the first day of AF and lower
temperatures. The day after ovulation, the temperature rises (usually
around .5 degrees, but this varies greatly). Temperatures remain high
until the end of the cycle when they drop down and AF arrives.
Charting will tell you when you have ovulated, but after a few months
of charting you may find you can also use it to predict when you will
ovulate.  Many women, for example, have a drop in temperature the
day they ovulate.  So if you wake up one morning with an especially
low temperature, you'll know you should DTD that day.

Advantages of Charting:

  • Learn your cycles and know when you typically ovulate
  • Confirm that you are ovulating, rather than having annovulatory
  • Learn signs to predict ovulation to better time BDing
  • Spot any fertility problems, such as a too-short luteal phase
    (the period between ovulation and the arrival of AF)
  • Ensure you are BDing at the right time for conception to occur
  • Spot a possible pregnancy (if temperature remain high past
    your usual luteal phase)
  • Know the your date of ovulation, which better predicts your
    pregnancy due date

The BEST charting book you can buy:

Sample Chart
On the chart below, we can see the charter ovulated on CD 13, which
was the day of a temp drop before the temp rise.
TTC Store
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