Unpaid leave?

Every week it's so difficult to comeplete 5.5 days of childcare work. I'm a toddler class teacher and currently 5 and half months pregnant ? It's so tiring to complete each day at school. Best part I was informed I got no more leave and mc left. As I exceeded 1 day will be unpaid. I'm only entitled for hospitalization leave which is not easy to get from my gyne and ofcourse I'm paisei to ask too. How to survive till end if this year ??