One Reddit user was concerned that his wife’s Fitbit was malfunctioning—she had logged 10 hours in the “fat burning zone,” but she wasn’t burning an appropriate number of calories. With the Fitbit reporting a high heart rate incommensurate with her activity level, the man knew that things weren’t adding up.  

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“My wifes (c) Fitbit is showing her heartbeat being consistently high over the last few days. 2 days ago, a somewhat normal day, she logged 10 hours in the fat burning zone, which i would think to be impossible based on her activity level,” YoungPTone said in his Reddit post. “Also her calories burned do seem accurate. I would imagine if she was in the the fat burning zone she would burn a ton of calories, so its not lining up. Im not sure if something is wrong with the sensor. is there a way to reset or recalibrate the device? Id like to try that before I contact customer service about a possible replacement.”

That’s when he took to Reddit to see if any other users were experiencing the same problem. Some users reported that the issue might be with Fitbit’s latest update, which made the heart rate monitor inconsistent. Then, one user on Reddit suggested that his wife may actually be pregnant. Sure enough, the husband replied one day later—”I’m going to be a dad!”