Rebecca Roberts couldn’t have been happier when she found out she was pregnant.

Twelve weeks later, things changed. She was happy, sure. But she was shocked as anyone could be as she discovered she was carrying two babies.

Two babies. Not one.

“I thought something awful had happened,” Roberts told The Washington Post. “The sonographer looked at me and was like, ‘Do you know you’re expecting twins?’”

“My initial reaction was how had I missed the second twin,” Walker said, according to “Good Morning America.” “And following this (I) was slightly relieved that it was not my mistake but a quite extraordinary pregnancy.”

Per The Washington Post, Roberts’ was pregnancy was deemed as superfetation — which is a rare condition where a woman who is pregnant can conceive another baby. It’s a rare situation that doesn’t happen often.

In fact, Dr. David Walker, the obstetrician who worked with Roberts, didn’t diagnose Roberts with the condition because it’s so rare, according to The Washington Post.

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It was an important moment for Roberts, who was trying for several years to get pregnant with her partner, Rhys Weaver.

“It was really, really shocking to be told there were two babies instead of one,” Roberts told “Good Morning America.”

Roberts ended up giving birth to her children on Sept. 17, 2020. Son Noah was born first. Noah’s sister Rosalie arrived two minutes later, according to The Washington Post.

“We got to see both of them as soon as they were born,” Roberts said. “It was absolutely beautiful.”

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