Some women use this information as a form of birth control. But it isn't very reliable for preventing pregnancy. Your body temperature dips a bit just before your ovary releases an egg. Then, 24 hours after the egg's release, your temperature rises and stays up for several days. After ovulation, it rises to You can track your cycle by taking your BBT every morning. Take your temperature at the same time every day before getting out of bed.
Next, record the results on a chart. If you have a somewhat regular cycle, the chart will help you predict when you will ovulate next.
The change in your body temperature is very slight, so you need to use a special thermometer. You can use a regular digital thermometer or buy a basal thermometer.
A basal thermometer shows you the temperature in tenths of a degree. This allows you to note tiny changes in body heat. This thermometer is faster and more exact than a regular thermometer. Use a simple Fahrenheit temperature chart or Celsius temperature chart to track your temperature for several months. However, if you want to use the basal body temperature along with another fertility awareness-based method for birth control, consult your health care provider first if:.
Take your basal body temperature every morning before getting out of bed. Use a digital oral thermometer or one specifically designed to measure basal body temperature. Make sure you get at least three hours of uninterrupted sleep each night to ensure an accurate reading. For the most accurate results, always take your temperature using the same method.
Try to take your temperature at the same time each day, when you first wake up. Track your temperature readings.
Record your daily basal body temperature and look for a pattern to emerge. You can do this on a paper chart or an app designed for this purpose. Ovulation has likely occurred when the slightly higher temperature remains steady for three days or more. Plan sex carefully during fertile days. You're most fertile about two days before your basal body temperature rises, but sperm can live up to five days in your reproductive tract.
If you're hoping to get pregnant, this is the time to have sex. If you're hoping to avoid pregnancy, unprotected sex is off-limits from the start of your menstrual period until three to four days after your basal body temperature rises — every month. Although there are numerous apps available for tracking menstrual cycles, only one is approved by the U. Natural Cycles uses an algorithm to calculate the days during your cycle when you're more likely to be fertile.
The app calculates your fertile days based on daily temperature readings as well as other information you input about your menstrual cycle. Mayo Clinic does not endorse companies or products. Advertising revenue supports our not-for-profit mission. This content does not have an English version. This content does not have an Arabic version. Sections for Basal body temperature for natural family planning About. Overview The basal body temperature method — a fertility awareness-based method — is a type of natural family planning.
When you get a good basal ovulation thermometer, it will measure accurately to two decimals. This is essential because the small changes that occur during the cycle can be as low as 0. Basal thermometers measure the temperature just like regular digital thermometers. However, they differ slightly because the basal thermometer is designed to measure very small increments to the second decimal place an example is To make things easier for you, we offer basal body thermometers that have unique features.
Some of them are listed below:. Most basal body thermometers can be used orally just like their regular counterparts. However, your temp can be taken vaginally or rectally. The main thing is to just choose one method and stick with it to avoid getting different readings. So set the alarm and once you wake up, place the Fertility2Family basal ovulation thermometer in your mouth or vagina and snooze until the unit beeps. Even if you doze off, the auto shut-off will kick in to save your battery life, while the memory function will save the reading so you can record it in your chat later on.
As you can see, using our basal body thermometer is pretty easy. We even provide instructions on how to use the ovulation thermometer to ensure you do not make mistakes. You will also get a tracking chart where you record the basal body temperature every other day. Remember to take your temperature simultaneously every day — immediately after waking up or before you leave the bed in the morning.
All readings can be recorded on the paper graph we provide or digitally on an application you can choose the app you like or the one that matches the thermometer brand.
These include:. Certain conditions like menopause and hypothyroidism can also affect the basal body temperature by causing temperature fluctuations because of the hot flashes. If you experience any of these factors, it will be nearly impossible to get an accurate reading. It might take you several cycles before you can know the accurate indication of ovulation.
Sometimes experts recommend using the basal body temperature technique in conjunction with cervical mucus monitoring and other physical ovulation signs , an ovulation predictor kit. You also need to follow the directions that come with your ovulation thermometer to get the best results.
Schedule appointments with your fertility expert or health care provider whenever you need help interpreting your chart. On the plus side, basal thermometers are inexpensive and easy to use.
They provide a no intervention way to know how your cycles operate so you can create a reasonable sex schedule to increase your chances of conception.
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