A New York couple have discovered they are expecting a child – all thanks to the wife’s Fitbit.

The pair had noticed unusual data on the woman's device, and so the husband turned to Reddit to ask for advice or any explanation, assuming it was simply a technical glitch.

He wrote:

Reddit user Thatwasunpleasant offered some advice, posting: "Has she experienced anything really stressful in the last few days or is it a possibility she is pregnant?"

Within a few days, the husband responded, confirming that yes, his wife was expecting.

Reddit users were quick to congratulate the parents-to-be, with Thatwasunpleasant

 posting "

I was right! Holy crap, a Reddit first for me! Congratulations!"

And what about after birth, the reactions to mums and non-mums seeing placenta is hilarious...

The elated dad-to-be also told Buzzfeed he was excited by the news.

“It’s definitely a great story to tell the baby one day about how it happened," he said.

So there you go, ladies - your Fitbit might just replace the good old wee on a stick pregnancy tests...

How did you find out you were pregnant?