How do I use the mercury-free glass basal to fertility chart?
The first day of your menstrual flow is DAY 1 on your fertility chart. Begin keeping track of your temperature on the first day of your menstrual period (first day you see red blood). Record your basal temperature every morning throughout your cycle (as well as other fertility signs listed on the chart). During the first two weeks or so of a woman’s cycle, her body temperature is lower. When you ovulate, a noticeable rise in body temperature takes place. A minimum temperature rise of 0.4 to 0.6 F can be measured – and this change will typically last through the duration of the menstrual cycle. If you know when this “thermal shift” is going to happen in your cycle, you can predict ovulation and the best time to time intercourse. Disposing of your old mercury basal thermometer: Mercury basal thermometers are no longer available in most states in the US – or will be removed from shelves shortly. If you elect to remove your current mercury thermometers from you house, please observe the fo
