More from Jon: here.
Fertilisation of the womb requires that sperm are deposited high in the vagina of a woman close to the time of ovulation, says my university physiology textbook. You did ask about the earliest point of gestation right?
Oh, reread your letter. That makes more sense.
Gestation as metaphor for art has a heavy pedigree. I’ve just been corralling the Oxen of the Sun in Ulysses for the second time and apart from the fact that reading that section feels like a labour of a different sort, it also gives us the subtle imagery of Joyce’s avatar Stephen spouting off about exactly this gestatory idea of art, while an actual parturient shits out a wee bairn (or whatever the Guinness-swillers call them) on the upstairs landing.