Hi! I am working in a highly reputed crown company of Canada and due in another 4 weeks with my first baby.?

The company policy extends maternity benefits to full time temporary employees the condition being that they have to come back and work for 6 months after the leave (which can be upto one year on EI) just like the permanent employees. But I was denied the benefits on the excuse that my one year contract term expires in a couple of months before I am in a position to return to work and the company may in the meantime choose to hire someone in my place during my absence. What can I do to ensure that I get extension in the current job (which I was sure to get in case I did not get myself into this pregnancy mess just like my male counterparts got extensions who joined along with me)? How can I save myself the trouble of applying for a new job and prepare and appear in endless series of interviews with a newborn baby to take care of single handedly (my husband lives in a differnt city and is not in a position to move with me for another 1 to 2 years and I dont have any other relative or friend who can help)? I am too new to Canada to understand the subtle nuiances. Please help.