CinderElla-ish by Peri Elizabeth Scott

It’s Vegas, but what are the odds that a one-night stand is your soulmate?

When Ella wakes up alone the morning after an amazing—and intimate—night with Rhys, her heart refuses to accept that he used her.
When Rhys returns to their room to find Ella gone, and all he has left of her is a slipper, his heart can’t believe their time together didn’t mean as much to her.
Indeed, they were the victims of a simple misunderstanding.
They both grapple with the loss and turn to work to cope, hiding behind pride. Rhys then decides to seek Ella out but can’t trace her, not that he’s giving up. Ella gathers the courage to contact Rhys—and tell him they made a baby together.
Briefly awkward, their reunion quickly supports what their hearts already know: they’re soulmates and meant to be together.