I can recommend Dr Fabrice Buff (OB / GYN) on Bahnhofstrasse - I am currently 26 weeks pregnant and so far he has been great Speaks English, French and German.
Bahnhofstrasse 106
8001 Zürich
T +41 (0)44 211 92 72
F +41 (0)44 211 93 02
gyn.bahnhofstrasse@bluewin.ch