Organic prenatal vitamins?

So I was told some prenatal vitamins are bad for you? Or bad for you to take.. My doctor gave me a over the counter brand that was really cheap but I don't feel comfortable taking them( but I still do) I want to get a new bottle asap but I don't know what to get.. I was wondering if they had organic ones possibly?? When I go to the pharmacy to ask they say they never heard of it & rush me out I think it's because I'm younger they don't take me seriously.. 😕