Utah twins pregnant with second set of twins

Two identical twins, who already each have one set of twins, are on their way to have a second set of twins in the spring.

The sisters, Kerri Bunker and Kelli Wall, are due to give birth two weeks apart, KSL-TV reports.

Since the Lindon, Utah, women had difficulties becoming pregnant, they both used in vitro fertilization for their first set of twins, according to the news organization.

"It's a unique story, because I always felt like my twin sister and I had a special bond," Bunker told KSL-TV. "And we've always kind of looked out for one another, and I thought 'oh wouldn't that be fun to have our kids experience that same thing.'"

But the second pregnancy stories have been a bit different. In June, Wall found out she was pregnant again, but the doctor initially told her it would only be one baby. (That is until the ultrasound revealed twins.) For Bunker, although it was unlikely she would get pregnant without medical assistance, she took a pregnancy test the day her sister found out she was expecting, and discovered she was also pregnant, according to KSL-TV.

"It was just one shock after another all summer long," Bunker told the news organization.

What's more? The women are also both teachers at the same school and they wed best friends.