Now that you, Rosie, have refreshed my memory in the other topic, I can think a little clearer in this one. SO......There was either a mishap at the sperm bank (Sami, Vivian or Kate), or Susan was involved in some other hanky panky (one of Stephano's minions) while Stephano was trying this artificially.
I think I have to wait and see what the writers decide, but I'll be trying to second guess them the whole time.
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"Life isn't about waiting for the storm to pass...
It's about learning to dance in the rain."