If you don't know what to believe about Natural Cycles and digital birth control, read on for the facts...
"Basal body temperature estimations work on the premise that progesterone will raise the BBT by a marginal 0.2 to 0.4%, but some studies have shown that even in the presence of ovulation, up to 75% of women have no rise in BBT, hence we conclude that they can be very inaccurate."The app states that out of 100 women over one year of 'typical' rather than 'perfect' use, seven on average get pregnant in total.
These numbers are in line with 'typical' use of the contraceptive pill, which is also estimated to have a 93% efficacy rate. The copper and hormonal coils come in at 99% for both typical and perfect use.Does it work with irregular cycles? "The precise number of fertile days in a woman’s menstrual cycle is largely uncertain and conception can occur during a 6 day window ending on the day of ovulation," Dr Shabana explains. "Some women have very long, erratic cycles - particularly those who have polycystic ovaries, so it may be impossible to define the window of ovulation as it may not occur at all, or a woman may need to test her BBT daily for 3 or 4 weeks in order to determine when to avoid intercourse.
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