She told the outlet that she and Legend had originally started with 20 embryos, three of which were deemed normal after being genetically tested and whose sexes were revealed as part of the testing.
"The first little girl didn't work, and then the second is Luna," she said.
The third embryo will be implanted in Teigen in the coming months, InStyle reported. She had revealed in January that their remaining embryo is male.
If Teigen's pregnancy after implantation is not viable, she and Legend will have to undergo the IVF process all over again to try and create more embryos.