Dear Vegemite_kid,
I am in London until next week and unfortunately do not have my copy of Medications and Mothers Milk by Thomas Hale with me. But I will look up and see what he says about these drugs when I return to Hong Kong.
It is true that a minute part of everything we eat and drink, including drugs, does get in to our milk. If these very small quantities are a worry to you, I recommend that you use a non hormonal method of contraception.
Best wishes,
SARAH