Triphasic vs. Biphasic Basal Body Temp (BBT) chart & pregnancy

The different types of BBT patterns

If you’re charting your basal body temperature (BBT) you’re probably familiar with these three patterns:⁣⁣⁣
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– Monophasic⁣⁣⁣
– Biphasic⁣⁣⁣
– Triphasic⁣⁣⁣
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Monophasic (one-phase) charts show no shift in temperature comparing before and after ovulation. Monophasic charts often occur during cycles where you don’t ovulate (anovulatory cycles).⁣
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Biphasic (two phases) pattern charts are your typical ovulatory charts. The temperature readings fluctuate a bit, but in general, they are low before ovulation, and high after.⁣⁣⁣
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Triphasic (three phases) pattern charts are similar to biphasic charts but instead of 2 phases, there are 3! The temperature before ovulation (low), after ovulation (high), and after implantation of the embryo (even higher).⁣⁣⁣ Let me show you an example. Do you see where that arrow is? That third shift in temperatures? That’s your triphasic pattern.⁣⁣⁣
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Example of a Triphasic Basal Body Temperature (BBT) chart

This is what a Triphasic Basal Body Temperature (BBT) chart looks like.

Triphasic Patterns and Hormones

There is a feedback loop of hCG (the pregnancy hormone that is secreted after the embryo has implanted) and the hormone Progesterone, that causes your temperature to rise.⁣⁣⁣
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These hormones cause changes in temperature that are helpful when charting, but a third jump in temperature, which is when the embryo implants, is surprisingly difficult to see on a chart! Analysis of close to 150,000 charts of Fertility Friend (“Triphasic Pattern and Pregnancy”.), showed that a triphasic chart was found only in 12.5% of charts. On average, this temp rise happens 9 days after ovulation, around the average day of implantation!⁣⁣⁣
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Not Just When You’re Pregnant

So 12.5% of pregnancy charts showed a triphasic chart, but that doesn’t actually tell us if it’s related to pregnancy if we don’t know how many charts of NON-pregnant women also showed a triphasic pattern. Well, it turns out that of the regular cycles, cycles where you don’t end up pregnant, only 4.5% of cycles show a triphasic pattern. Quite a big difference! ⁣⁣⁣
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But can we conclude that a triphasic pattern means you’re pregnant?: No, even though the prevalence of a triphasic pattern was higher in pregnancy cycles, they still occurred among those who DID NOT get pregnant.⁣⁣⁣
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Most importantly, NOT seeing a triphasic pattern doesn’t mean you’re not pregnant either, as the vast majority of women who did conceive had a plain ol’ biphasic pattern!⁣⁣⁣

Katelyn

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