" Basal body temperature method: Your basal body temperature measures a change in the temperature that occurs after ovulation and remains elevated until your next period. By looking at charting from a few cycles, the temperatures can reveal a pattern from which ovulation can be anticipated. The steps below can help you as you begin to track your temperature and identify when you are ovulating.
Step 1: Take your temperature orally each morning before you become active.
Step 2: Use a basal thermometer which recognizes small changes in your temperature. Your body temperature will only rise between 0.4 and 1 degree ferenheit when you ovulate. Buy a Basal Thermometer Now.
Step 3: Record you temperature every day on your fertility tracking calendar.
If you record it every day, you will see that prior to ovulation your temperature is rather consistent. As you get closer to ovulation, you may have a slight decline, but it will be followed by a sharp increase after ovulation. The increase in temperature is the sign that ovulation has just occurred. Because the increase happens after you have ovulated, this method is best used by those who have time to track and study their charts for a couple months, to ensure the best chances of conception. Illness, lack of sleep, and alcohol or drug use can affect your temperature and make it difficult to establish an accurate reading."