The temperature in your mouth when you wake up in the morning. It tells you when progesterone has kicked in, signaling that ovulation has occurred.
Cervical Fluid is a vaginal secretion. It changes in viscosity through the course of your cycle and tells you when your estrogen level is rising, indicating impending ovulation.
BBT and Cervical Fluid tell you about the hormone levels in your body. To understand how the primary fertility signs relate to an average 28 day menstrual cycle, hover over the graph below:
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