Getting a new job

I'm getting a new job with a contracting company as a sales rep. I didn't disclose with them that I am pregnant (12+4) and I'm worried that they'll think a pregnant woman isn't good for business selling smart home systems. My current job is a mess, I work for a restraunt and the management end, the co workers and the owner are all terrible. The place should be shut down to be redone with a whole new staff. I'm just scared that these people will think I'm not a good worker or something.