The birth.

Chloe went into labour roughly 7 months after. Your mother had been confused on the timeline but chalked it up to being in her womb. From here research no one had ever given birth while unbirthed before. Your mother coached you through helping Chloe give birth. There were luckily no complications, and Chloe gave birth to fraternal twins like you. As soon as they were out of her, A new umbilical cord grew in your mother's womb, and essentially took over from Chloe's.