How to hide pregnancy at work

So I lost my job with covid and had to find a new job. I ended up getting an offer from Starbucks which I'm super excited about, but I didn't tell them im pregnant. I really needed a job and I know they're not "supposed" to discriminate against pregnant women but I couldn't risk it I have a toddler to feed and a house to pay for. I am going to tell them but I just want to wait until after I work a few weeks if I can. Do you have any tips on how to hide pregnancy until then? I'm 20 weeks so im showing a little but im small so Its not anything crazy yet.

***also I already tried unemployment and was told to go on disability since I'm pregnant, but I don't qualify for disability because I have a healthy pregnancy, so government aid isn't an option***