Basal Body Temperature is your temperature when you're fully at rest.
You'll be most fertile during the two to three days before your temperature rises. By tracking your basal body temperature each day, you may be able to predict when you'll ovulate. :)
If you're trying to conceive, this method can be great tool to determine the best days to have sex.
Here below are tips to check BBT at home.
Before taking your temperature, make sure you have a minimum of 3 hours consecutive sleep.
Take your basal body temperature every morning before getting out of bed. (before any other activities, such as going to the bathroom)
Record your temperature soon after it is taken.
Make dots on the appropriate temperature and connect the dots with straight lines.
Note events such as stress, or illness in the miscellaneous section.
Note events such as breast distension, headache, bleeding, spotting etc.
Temperature take late should be noted in the time taken section.