Maternity rights q! 28th aug is supposed to be my last day at work as i have 4 weeks of unused annual leave which i wanted to take then to start my maternity leave on 1st oct. now my employer is asking me not to use my annual leave and work till 1st of oct (3rd oct is my due date) anddddd do saturday overtime! can they do this??? do i not need to use up annual leave before my maternity leave starts?