Contraceptive app under fire for unwanted pregnancies

SAN FRANCISCO (KRON/CNN) — A contraceptive app is under fire after more than three dozen users experienced unplanned pregnancies.

The Natural Cycles app, a certified contraceptive in Europe, uses an algorithm to predict when a woman is most fertile. But a Swedish hospital is raising attention about unintended pregnancies related to the app.

Södersjukhuset hospital in Stockholm said at least 37 women sought abortions at its facilities after using it as a birth control method.

The app has nearly 700,000 users worldwide.

The makers of Natural Cycles are searching for answers and ways to fix the problem. Officials say, no contraception is 100-percent effective. In the US it bills itself as a fertility monitoring app rather than a contraception method. The company’s website warns that one out of 100 women who use the app, may become pregnant. provides commenting to allow for constructive discussion on the stories we cover. In order to comment here, you acknowledge you have read and agreed to our Terms of Service. Commenters who violate these terms, including use of vulgar language or racial slurs, will be banned. Please be respectful of the opinions of others and keep the conversation on topic and civil. If you see an inappropriate comment, please flag it for our moderators to review.

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