Jul 01, 2016 12:07 AM EDT By Don Don Navidad, UniversityHerald Reporter

Researchers stated that most of the smartphone apps that help women track days of fertility for the purpose of getting pregnant or preventing pregnancy  are not reliable enough. It may be useful, but not enough.

In a recent study at Georgetown University, most of the smartphone apps tested failed to accurately track fertile days without false negatives.

The number of women using smartphone apps is increasing for the reason of an interest in using fertility awareness based methods for pregnancy planning. But, most apps of smartphone do not use evidence-based FABMs to calculate and estimate the days of the month when women will be fertile, UPI reported.

In the study, the researchers tested more than half of the apps which include warnings and discouraging against their use to prevent pregnancy, and lead these women to questions about their accuracy.

In a press release of an adjunct associate professor at the Georgetown University School of Medicine - Dr. Marguerite Duane, the doctor said that when women learned how to track their fertility signs, Dr. Duane recommend that women must have instruction from a trained educator and then look for a smartphone app that reached a score of 4 or more on mean accuracy and authority in their review.

The research was headed by Dr. Marguerite Duane along with Alison Contreras, PhD, Amina White, MD, MA, of the University of North Carolina at Chapel Hill and also Wake Forest School of Medicine's Elizabeth T. Jensen, MPH, PhD, Science Daily reported.

However, Dr. Robert Setton, the author of the previous study and a researcher at Weill Cornell Medicine and New York Presbyterian Hospital, stated that it was vital women who understood when is their fertile window.

Dr. Setton also said that before women use any website or applications, it is essential for women to understand that the actual fertile window consists of the day of ovulation, with the addition of the preceding five cycle days, Daily Mail reported.

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