Health & Pregnancy

How to Chart Your Menstrual Cycle

Trying to get pregnant? It doesn't always happen as quickly as you'd like. But don't jump to conclusions too quickly -- you may just need to work on your timing.

It may help to chart your menstrual cycle -- that way, you'll better understand when you have the best chance of becoming pregnant.

As you go through your cycle, your body gives you clues about when it is going into ovulation. You just need to know how to look for them.

Why Chart Your Menstrual Cycle?

By tracking a few things every day, you may improve your odds of figuring out when you're most fertile and becoming pregnant.

Charting involves:

• Taking your basal body temperature
• Examining your cervical mucus
• Noting when your menstrual period began
• Noting when you had sexual intercourse

Knowing this information can make a difference. Although the average couple conceives after about five or six months of trying, people who know when ovulation is occurring and have sex during that time can conceive in less than three or four months. 

Charting your menstrual cycle is also a good way to put you more in touch with your body, and it comes in handy if you consult a doctor about fertility.  

Taking Your Basal Body Temperature

Before ovulation, a woman's basal body temperature is usually about 97.0 to 97.5 degrees Fahrenheit, although those numbers can vary from woman to woman. During ovulation, the body releases the hormone progesterone, which slightly raises basal body temperature a day or two after ovulation -- usually by just 0.1 or 0.2 degrees. That temperature will probably stay elevated until your next cycle begins. If you become pregnant during that cycle, your temperature will stay elevated beyond that.

A tenth of a degree difference may not sound like much, but it may mean that ovulation has passed, as has the chance to become pregnant for that cycle. By charting your temperature every day over several cycles, you may start to see a pattern and be able to predict when you are most fertile.

Then again, it's not a sure thing. Recent research has shown that it may not be as effective as once thought. Still, there's no downside.

Although basal body temperature charting is a widely used technique, it is by no means foolproof. Some women may not see a clear pattern emerge by recording their temperature. Since ovulation can occur at different times in your cycle from one month to the next, your basal body temperature chart may not be effective at predicting when you'll ovulate.

Tips for Taking Your Basal Body Temperature

• Begin taking your temperature on the first day of your period.
• Take it at about the same time every day, preferably before you get out of bed in the morning and before any activity.
• Don't do anything -- eat, drink, smoke, or even move around -- before you take your temperature.
• You can take your temperature however you want -- orally, rectally, or vaginally -- but make sure you use the same technique each time.
• Write down your temperature every day on your fertility chart; you can make a graph with each day of your cycle on the bottom and temperatures on the left, connecting the dots as you go.
• Keep in mind that you will probably get some occasional freak readings -- either high or low temperatures -- that don't fit into the larger pattern. If they don't happen often, don't worry about them.
• You may want to have your doctor look at your chart to help you interpret it.