Hi,

I wouldn't be taking Zyban while TTC. Its a Pregnancy Category B2:

Category B2
Drugs that have been taken by only a limited number of pregnant women and women of childbearing age, without an increase in the frequency of malformation or other direct or indirect harmful effects on the human fetus having been observed. Studies in animals[1] are inadequate or may be lacking, but available data show no evidence of an increased occurrence of fetal damage. For drugs in categories B1, B2 and B3, human data are lacking or inadequate and subcategorisation is therefore based on available animal data. The allocation of a B category does not imply greater safety than the C category.