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###### The three different phases
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- [Pre-ovulatory phase](nfp/preovu)
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- [Peri-ovulatory phase](nfp/periovu)
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- [Post-ovulatory phase](nfp/postovu) |
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- [Post-ovulatory phase](nfp/postovu)
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# General Information
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The sympto-thermal-method enables people with menstrual cycles to track bodily symptoms for fertility awareness and is a well researched NFP (natural family planning) method.
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:eyes: Please do read more about [the science of it here](https://academic.oup.com/humrep/article/22/5/1310/2914315).
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### Pearl Index
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According to [Pro Familia](https://www.ippf.org/about-us/member-associations/germany) the [pearl-index](https://www.profamilia.de/erwachsene/verhuetung/pearl-index.html) of:
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* the sympto-thermal method is 0.4-1.8,
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* the pill is 0.1-0.9
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* using condoms is 2-12.
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### What to track?
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The sympto-thermal method is suitable/works best for people with fairly regular periods. Measuring your:
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1. basal body temperature (also known as wake-up temperature) every day,
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1. checking your cervix or cervical mucus and
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1. tracking menstrual bleeding
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requires precise observation and implicates a learning process. You will get to know your body and the reproductive cycles much more intensely. drip will help you save your observations and calculate your fertility status when possible.
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# Overview of the rules according to sympto-thermal NFP
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The main goal of the sympto-thermal method is to detect when ovulation has happened (because there is no way to predict it). Scientific studies help us determine ovulation and understand fertility.
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The beginning of each cycle starts with menstrual bleeding. In drip, each bleeding value that is not marked as "excluded" will indicate the first day of a menstrual cycle unless bleeding has been tracked within 1-2 days before
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### Three different phases: pre-, peri- & post-ovulatory
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Each cycle can have 1, 2 or 3 different phases:
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1. Pre-ovulatory or the phase before ovulation,
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1. peri-ovulatory or the phase during/around ovulation and
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1. post-ovulatory or the phase after ovulation.
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The phases indicate the fertility status of a person: pre-ovulatory phase indicates infertility prior to ovulation, peri-ovulatory phase indicates fertility during ovulation and post-ovulatory indicates infertility after ovulation until the end of that cycle.
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In order to detect a pre-ovulatory phase, data from previous cycles is needed. If the sympto-thermal method for a current cycle is applied, a peri- and post-ovulatory phase may be detected even if there is no data from previous cycles. To detect a post-ovulatory phase in a current cycle, both the temperature and the secondary symptom (cervical mucus or cervix) must show:
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* a valid temperature shift AND
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* a valid shift in quality of cervical mucus OR cervix.
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This will differentiate the peri-ovulatory from a post-ovulatory phase. |
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