Hey Dee, you can follow this guideline from MOM to plan your HL : https://www.mom.gov.sg/employment-practices/leave/maternity-leave/planning-your-leave#:~:text=You%20must%20take%20the%20first,9%20June%20and%207%20July However, this also subject to agreement or T&C based on your company/HR.
For HL - need to be given by doctor first. Not so easy to get. Often only given is like 37 weeks like that and from private doctor and private hospital