Have you finished the Missing child quest? Have you renovated your shed where you can brew potions? these are prerequisites.It's just that she doesn't get pregnant, I tried for about 15 days in a row when I could and there was no change or progress in the mission... I don't know what to try anymore, in the guide they mentioned something about a tonic to increase fertility with the oracle, When I go with the oracle, it doesn't give me a choice either.