I am 5 weeks pregnant . can i take cocculine for nausea ?

Maybe ok, but...: Truly homeopathic "medications" are made by repeated dilutions, so that the ingredient is not really in the medication anymore (just the "essence" of it remains). That means there is no active ingredient left to give you any benefit. However, that also implies that the homeopathic "medicine" should be safe to take for its placebo effect, UNLESS some other non-homeopathic ingredients were added.