'I got pregnant while I was already three weeks pregnant and now have twins'

A woman who got pregnant while already three weeks pregnant has given birth to healthy twins in an extremely rare phenomenon.

Rebecca Robertson found out she was having twins, but was shocked when she was told that one was smaller than the other.

Exactly three weeks smaller.

There have been just 13 other documented cases of superfetation in the world before little Noah and Rosalie were born in September last year.

Speaking to the Mirror, Rebecca said her pregnancy was a rollercoaster of emotions as she felt doctors were almost trying to prove there was something wrong with the smaller twin, as superfetation is so unusual.

The mum-of-three said she and partner Rhys Weaver found out they were having a baby back in February last year, before the UK's first coronavirus lockdown.

The 39-year-old said: "I was offered an early scan at seven weeks, Rhys was able to come to the scan too as hospitals were still open at that point. We saw our tiny, little baby, just. It was so small and we were told we were expecting one baby.

"Fast forward a few weeks and I had my 12 week scan. Unfortunately Rhys wasn’t allowed in the hospital as lockdown had begun."

Rebecca from Trowbridge, Wiltshire, was told she was expecting twins, but added that things suddenly got "even more amazing".

Credit: Read more from mirror.co.uk