pregnant and new job 😬

So me and my other half have been trying for baby number t I for around nine months. Last month I got a new job. Which has so much growth and is just starting off as a new brand which I would be responsible for developing. New Year's eve we found out I'm pregnant. What should I do?! do I tell my new boss straight away that I'm pregnant or wait till three months and I've settled into the company? I don't want to loose my job!! 😬