Monozygotic twinning itself after elective single embryo transfer is uncommon, occurring in no more than roughly 3% of cases.

Women with a history of multiple high-quality embryo transfers without pregnancy had no greater risk for common pregnancy complications once pregnant than women with single successful embryo transfers ...

Some fertility treatments, such as IVF, might increase the possibility of having twins due to multiple embryos being transferred or the spontaneous splitting of one embryo. But it’s much more likely ...