🚧 Work in progress! 🚧
The period tracking app drip implements the sympto-thermal method for fertility awareness.
The sympto-thermal method
The method enables people with menstrual cycles to track bodily symptoms for fertility awareness and is a well researched NFP (natural family planning) method.
- sympto-thermal method: 0.4-1.8
- pill: 0.1-0.9
- condoms: 2-12
What to track?
The sympto-thermal method is suitable/works best for people with fairly regular periods. Adherance to the method requires one to measure/track the following:
- measure your basal body temperature (also known as wake-up temperature) every day,
- check your cervix or cervical mucus,
- track your menstrual bleeding.
This requires precise observation and can take time to learn. As a result, you will get to know your body and your reproductive cycles much more intensely. drip will help you save your observations and calculate your fertility status when possible.
Overview of the rules according to the sympto-thermal method
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.
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 beforehand.
Three different phases: pre-, peri- & post-ovulatory
Each cycle can have 1, 2 or 3 different phases:
- Pre-ovulatory or the phase before ovulation,
- peri-ovulatory or the phase during/around ovulation and
- post-ovulatory or the phase after ovulation.
The phases indicate fertility status: the pre-ovulatory phase indicates infertility prior to ovulation, the peri-ovulatory phase indicates fertility during ovulation, and the post-ovulatory phase indicates infertility after ovulation until the end of that cycle.
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 display the following:
- a valid temperature shift AND
- a valid shift in the quality of cervical mucus OR cervix.
This will differentiate the peri-ovulatory phase from a post-ovulatory phase.