Pregnant after starting new job

Hi mummies! I accepted a job offer and then found out I was pregnant. Currently at 9weeks now and trying to keep this a secret till my probation ends in early November. I was planning to let my boss know of my pregnancy after I've been confirmed (or maybe a month after confirmation). My worry is that I might be terminated when they get informed. I know it's kinda illegal to terminate pregnant employees, but do workplaces secretly practice this as well? I don't want to lose my job as the pay during maternity leave would really help a lot 😢