Marilyn boards the hypership without declaring she’s pregnant. How could she? He swore he was on the pill.
She arrives in Tau Ceti, disembarks, and lives the rest of her life without knowing. The fetus remains in quantum superposition about halfway there.
“Is this Limbo?” it asks a passing cat.
“Not anymore,” says the cat, “but they used to call it that, yes. It’s where you go when you can no longer be measured.”
“I suppose I should go adventuring.” The fetus wiggles an arm, probably. “Anything I’m going to need?”
“Just a weapon,” sighs the cat, and hands it a ruler.