pregnancy and new hire?

[newnurse7130]

I recently accepted a job offer, and the day after I find out I'm pregnant. I have been turned down jobs for my last pregnancy. I don't want to reveal it this time unless I'm fully hired on or I have to. During the physical, do they check for pregnancy at all? My fiancée mentioned that they might and I'm worried that they're going to withdrawal their offer. I want this job, and I'm terrified that I can't have both.