Hi everyone! I'm 12 weeks pregnant and not yet registered for prenatal…

Hi everyone! I'm 12 weeks pregnant and not yet registered for prenatal care. I want to get a job that has a full benefits package. Right now I'm going through a medical exam/commission, and the gynecologist didn't examine me — she just gave a certificate saying I'm healthy and can work. Now I don't know how to behave or what to do. Should I get the job or register first? Tell them about the pregnancy or not — but then they probably won't hire me. I'm confused. Has anyone done something like this? Please advise. I know it's a strange question, but still...