Advice please !!!

As of today I’m 18 weeks pregnant. I just got laid off my job which I’m angry about . I had a phone interview today for a motor vehicle division csr position . I have my face to face interview tomorrow the position is part time . My worry is I don’t want to tell them I’m pregnant because I know they will discriminate me . Even tho employers say they don’t they do . Should I go ahead and tell them or wait ??? Thank you !