interviewing while pregnant ?

Lisa
So i'm interviewing for a job at aldi and although i am not showing yet (mostly because i'm a bit chubby, lol) i'm worried about how I should go about this. Everyone I know has told me not to say anything until I have the job but this job requires me to lift 40lbs doing stock. Of course I will aslo work at the registers(sitting down because aldi has chairs) but also doing things around the entire store (cleaning, etc) my first appointment is in less than a week so i will ask my doctor if i can lift 40lbs or not but i'm worried that the employer will see me as unfit for the job. What do i do ???