1 / 10A British woman has delivered two babies at the same time — who were conceived three weeks apart, according to new reports.2 / 10Rebecca Roberts, 39, was already pregnant with her son, Noah, when she conceived her daughter, Rosalie, the Independent reported.3 / 10“We feel really lucky. It’s so lucky to have twins anyway but to have such special twins, it’s so lovely, it’s wonderful, they are a blessing,” Roberts told the outlet.4 / 10Roberts said that she and her husband, Rhys, had gone to a fertility clinic in Bath, England, to get a drug to help with ovulation.5 / 10“On my first cycle on that drug we became pregnant,” she told CBS News.It wasn’t until the 12-week scan for her first baby that she was expecting two children.6 / 10“I had just been having a conversation with the sonographer about my previous scan so she was aware that I was only having one baby so she was so silent. I thought something awful had happened because she didn’t say anything,” she told the Independent.7 / 10“Then she looked at me and said did you know you’re expecting twins. My heart skipped a beat, I actually said to her ‘is his real?”8 / 10Roberts had become pregnant with the twins through a phenomenon known as superfetation. It occurs when an egg is released from a woman’s ovary after she is already pregnant and implants alongside the first embryo.9 / 10Superfetation — which produces what are known as “super twins” — is very rare and there are only a few documented cases in the world, the outlets reported10 / 10Though her babies had different due dates, Roberts gave birth to both on the same day in September 2020, the outlets reported. “They couldn’t be born separately as there’s a massive risk of infection,” Roberts said. “It was strange, as Rosalie’s due date was three weeks after Noah’s.” But she said that she’s grateful for the experience which taught her that “anything’s possible.”“This wasn’t supposed to happen, but it has. The female body is amazing,” she told CBS News.