Dannette thought she had kidney stones, so she went to the ER. She left with triplets.

In a shock turn of events, a Colorado mother of two has given birth to triplets, despite having no idea that she was 34 weeks pregnant.

After experiencing pain in her back and side, Dannette Glitz went to hospital thinking she needed kidney stones removed, only to discover she was pregnant with triplets and was instead wheeled into urgent care for an immediate C-section.

Dannette’s pain had become so severe it “hurt to move and even breathe”, but despite having given birth to two children previously, she was completely unaware that she was pregnant.

Throughout her pregnancy, Dannette never experienced morning sickness or even felt movement from the growing babies.

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“We went to urgent care thinking I’m going to have to have surgery to break the stones up,” Dannette wrote on Facebook.

“Well, [the doctor] comes back in after doing a urine sample and says, ‘You’re pregnant’.”

To her shock and disbelief, Dannette was then told she was possibly carrying twins. It wasn’t until the doctor began performing surgery that it became clear that she was actually carrying triplets.

“The doctor goes, Baby A is a boy, Baby B is a girl, and then the doctor yells, ‘I need another blanket in here, there’s a third!'” she said.

Nikki Marie, Blaze Jackson and Gypsy Zada were born on August 11 at 34 weeks. All three babies are healthy.

Posting the news to Facebook with a photo of the triplets, Dannette wrote, "Well this was a huge shock."

The surprise birth brings her family with husband Austin to seven.

Austin says he's "overwhelmed" by the situation, but happy knowing his wife and children are healthy.

Dannette herself says the situation is as bizarre as it sounds.

Speaking with local media station Kota TV, Dannette said, "You don't ever see triplets being conceived naturally, let alone going 34 weeks without knowing."

She says now that the babies are at home, she's "still in shock".

"So everyone's like, I can't believe it, we're still in shock, trust me, we know what you mean, like I go to the doctor's thinking I'll have surgery for kidney stones and end up going into labour with a C-section that night. It's crazy."

It's estimated that conceiving triplets naturally occurs in just 1 in every 9,000 births.

With the family of seven now facing the unexpected costs of three newborns, a fundraiser has been set up to assist them.

More than $1,200 has been raised so far.

Mamamia has reached out to Dannette for comment.