It was supposed to be something fun for Rylee and her mum to do before opening a bottle of wine, but having taken pregnancy tests, a surprise TikTok baby was discovered.

TikTok user Rylee, who goes by @rdubbb, had no idea what was about to happen when she started recording a video with her mom, who was worried that her daughter was pregnant.

The duo decided to both take a pregnancy test together, to guarantee that it was safe to have the glass of wine they were both craving so much.

In the clip, both women are standing at the kitchen counter waiting for the results. There is both wine and water at the ready, and Rylee's mom is already eying a nice, tall glass.

What happened next, though, is a shock to both women. Still, it's not the plot twist that you were probably expecting.

One of the tests is positive, but it's not Rylee's – it's her mom's! It looks like the TikToker, who boasts more than 150,000 followers, is getting a new sibling.

At first, the TikToker thought that her mom is joking and said "whatever," but then she took a look at her mom's pregnancy test and her jaw dropped to the floor.

The clip, aptly titled "That one time I took a pregnancy test with my mom and ended up with a new sibling Lolol" got twelve million views in just three days.

It's clear from the comments that the users were just as surprised as Rylee.

One fan wrote "I can't imagine having a GROWN child then having to do it all over again." Another quipped, "I'd cry because I couldn't drink wine."

Rylee, overwhelmed by the success of her TikTok, recorded a follow-up video in which she explains what led to the mother-daughter pregnancy test video.

In it, she explained that she had been moody and that her period was late, so her mom suggested that she take a test. While they were having that same conversation, her mum realized that her period was also late, so the two women decided to take the tests together.

In a later follow-up video, Rylee revealed that she's getting a new little brother. It's her mother's sixth pregnancy, and it was anything but planned!