Utah Twins Each Expecting Their Second Set of Twins Call It 'Craziest Story' "Are you kidding me? Is this happening again?" one husband said.

 -- Kerri Bunker, 36, is an identical twin with her sister, Kelli Wall, in central Utah. In what Kerri calls "the craziest story," both have their own sets of twins and are expecting a second pair of twins this coming March.

"We both dealt with fertility issues," Bunker told ABC News. They both received in vitro fertilization treatments and now Kerri's twins are turning 4 years old next week, while her sister's twins will be 5 in October.

"Those who are struggling with fertility: don’t give up," Bunker said. "I consider each of my children miracles that I thought we couldn't have. Blessings come in the strangest of ways."

Though Kerri's doctors said the chances of her getting pregnant on her own were "less than five percent," not only does she have a 2-year-old without fertility treatment, she is expecting a second set of twins in March without any medical help.

"I was somehow magically able to get pregnant on my own, and they are twins, which is crazy," Bunker said. "Isn’t it the craziest story? After it seeing it go across the country yesterday, I see it’s a unique story."

And Kelli is expecting her a second set of twins about two weeks before her sister, after receiving a fertility treatment. The doctors for the sisters aren't sure if the twins-to-be will be fraternal or identical.

"There is a chance they could be identical but it doesn’t mean that they are," Bunker said.

What does Kerri's husband think of the ever-expanding family?

"He’s in shock like the rest of us," she said. "We sat and stared at each other, like, 'Are you kidding me? Is this happening again?'"

Bunker said her first pregnancy was "hard for me," explaining, "we had some complications the first go-round." Bunker comes from a family of six and enjoyed growing up with a large family. But when she married at age 30, she didn't expect to have many children.

"I thought, if we have one or two kids that would be great," she said, recalling the time she was first married. "Eleven months later, here I have a set. To think we are both pregnant again with twins is unreal."

"I teach and my husband teaches, and it’s not like we are rolling in the dough," she said. "Never in a million years did I think I would have a big family."

But she said she loves having a twin sister and, "I have always had a best friend. My sister and I call each other every night." While the two live about 40 minutes away from each other now, they teach at the same school in Lindon, Utah, and happened to marry best friends. In the next year, Bunker and her family plan to move next door to her sister.

"Now that the shock has worn off, we are shocked and ecstatic. Somehow we will manage financially and figure it out," Bunker said.