A Utah woman is pregnant with two babies — who aren’t twins — thanks to a rare condition that causes her to have two uteruses, KSL.com reported.

Angie Cromar’s doctors were shocked when her first ultrasound revealed two babies at slightly different stages of development.

"[He said] I'm five weeks and four days in one, and six weeks and one day in the other," Cromar said.

Cromar knew she was born with a rare condition called didelphys, meaning she had two uteruses, but the chances of conceiving in both at the same time are 1 in 5 million, according to the report.

In a female fetus, the uterus starts out as two small tubes. As the fetus develops, the tubes normally join to create one larger, hollow organ — the uterus. Sometimes, however, the tubes don't join completely, and each one develops into a separate cavity, the Mayo Clinic said on its website.

"Probably less than 100, so far, worldwide, have been reported; so she's a member of a small, elite club," Dr. Steve Terry, Cromar’s ob-gyn in Murray, Utah said of her condition.

Cromar’s husband couldn’t believe the news either.

"It was exciting. He didn't believe me for a little while, though," she said.

Although the rare condition hasn’t affected her other pregnancies, Cromar, a labor and delivery nurse, knows that her condition presents certain risks, including pre-term labor and low birth weight.

“Sometimes, these are considered high-risk pregnancies,” Dr. Manny Alvarez, senior managing health editor of Foxnews.com and chairman of ob-gyn at Hackensack University Medical Center in Hackensack, N.J. said.

Alvarez, who specializes in high-risk pregnancies, told FoxNews.com that didelphys is classified as a mullerian deformity. He added that a normal uterus looks like a pair, but this kind of defect sometimes causes both uteruses to have a heart shape.

"Oh, I'm a little nervous, just because I know what can happen, but I'm really excited," Cromar said.

Click here to read more from KLS.com.