Hi Sweetmelf,
I use Cetaphil face wash for normal to oily skin. It works really well...however - I don't think it is made to kill acne bacteria.
My OB & derm both ok'd the use of topical erythromycin during pregnancy. I've done a ton of research on the web about it and all of the info. I've read says it's fine to use.
You may also want to do a search ... I know there have been some posts on this topic as well.
All the best,
Kris