Natural Cycles, however, responded that "no contraception is 100 percent", and unwanted pregnancies is an unfortunate risk as with any type of contraception.
"We'd like to reassure the medical community and the public that Natural Cycles is an effective, clinically proven, form of contraception, which hundreds of thousands of women worldwide trust as their birth control to prevent or plan a pregnancy".
"Theoretically, an app [like Natural Cycles] should be able to track your fertility accurately, but things can happen unexpectedly in terms of ovulation".
Natural Cycles claimed that its inclusion of additional data, like a woman's temperature measured by a supplied thermometer, made it more reliable, and it was this which made it the first such app to be officially certified as a medical device by the European Union. For women who have irregular cycles or who don't ovulate at the same time every month, apps like this won't work.
A Swedish hospital has filed a formal complaint about the "contraceptive app" Natural Cycles after it was blamed for 37 unwanted pregnancies ...
The Swedish-based Natural Cycles confirmed the report to CNNMoney, calling unplanned pregnancies an "inevitable reality".
European Union-certified Natural Cycles app that claims 99 percent efficacy on ideal use and 93 percent effectiveness on typical use is now under fire for falling short of its promise to prevent pregnancies.
Marketed as a hormone-free way to protect from pregnancy, without unpleasant side-effects associated with other contraception, it has become quite popular and has 700,000 active subscribers.
"At first sight, the numbers mentioned in the media are not surprising given the popularity of the app and in line with our efficacy rates", the company said. The app is designed for users aged 18 years and over, and Natural Cycles says younger users should consider another form of contraception.
Natural Cycles also confirmed they had not yet received any information from Södersjukhuset hospital, but said they are now in touch with the MPA and is working to respond to individual cases. In November 2017, the app, founded by husband and wife duo Dr. Raoul Scherwitzl and Dr. Elina Berglund, received over $30 million in funding.
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