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Basal Body Temperature and Implantation Bleeding

How Ovulation Affects Basal Body Temperature

As part of a fertility awareness program, many women take their basal body temperature upon waking up for several days in a row in order to determine their specific day of ovulation. On average, ovulation will cause a rise in BBT by roughly one-half to one full degree Fahrenheit, or one-fourth to one-half of a degree Celsius. Before ovulation occurs, the typical female body temperature ranges anywhere between 97.1 and 97.8 degrees Fahrenheit. Roughly 2 to 3 days after ovulation, changes in hormonal activity typically cause a rise of 0.40-1 full degree in BBT.

This tendency of the body to have warmer temperatures after ovulation is referred to as a biphasic pattern. Woman’s organism simply tries to provide the best conditions for implantation. The pre-ovulation period is known as the follicular phase, and the post-ovulation period is known as the luteal phase. For women looking to get pregnant, charting the patterns of change in basal body temperature can be a good way to indicate the best days for conception (or when to abstain from having sex if pregnancy is not planned). Moreover, with this chart and period calendar it is theoretically possible to determine the so-called ‘safe’ days.

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