Should I tell potential employer of my pregnancy?

Yajaira

Hello, I am 21 weeks pregnant and I will be having two interviews for teaching positions. I am due at the end of October. Should I tell them about it? I can still hide it with loose clothes. I don’t want my pregnancy to reduce my opportunities of getting hired. I know it’s against the law for them to discriminate me but I just feel if I tell them I won’t get hired. I think it’s best to wait until I get a formal offer to let them know. I know I have a good chance of getting hired in one of the schools just because I know the principal and vice principal. I know I have no obligation on telling them but I am so confuse on what to do! Any suggestions. Thank you!