If I know I'm pregnant now (1month), how long do I need to inform the company? What if they terminate me? :(

You will need to inform them within the 20 weeks into the pregnancy so they could plan someone to take over your duties when you are away on maternity leave. If in your job for more than 3 months, you are protected under maternity protection. In any case of them terminating you without valid reason, they will still have to pay you the maternity benefits. http://www.mom.gov.sg/faq/maternity-leave/do-i-need-to-inform-my-employer-of-my-pregnancy-in-advance http://www.mom.gov.sg/faq/maternity-leave/i-ve-been-dismissed-from-my-job-during-pregnancy-what-can-i-do