Getting pregnant can be tricky. One way an aspiring mother can make it easier is to know when she’s most fertile, a period spanning a few days every month when her body undergoes hormonal changes. And certain body-tracking wristbands may be able to detect these subtle shifts in your biometrics, like your heart rate and body temperature. Depending on the device, it could even help you go one step further and actually conceive.

Recently, the women’s health data startup Clue ran an internal test to see if Fitbits could improve the experience of women who track their periods on its popular app and are trying to get pregnant. Scientists put Fitbits on five employees and found that the devices could track their resting heart rate patterns during their menstrual cycles.

The devices also showed that resting heart rate spiked shortly before ovulation began, according to the Berlin company, which presented data from the small, preliminary study at the European Society of Human Reproduction and Embryology’s annual meeting this month.

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photo: Getty