Contract not being continued due to my pregnancy

[sweetshagun123@gmail.com]

Respected Mam
I joined Army School which is a private institute in the year 2009 on contractual basis and worked there continuously for 3years ,than my contract was renewed again and I worked for 2 more years in the same school.In these 5 years of service I was never issued any showcause, warning letter , explanation letter, observation letter and everybody in the institute was happy with my work .But this year when again my contract was to be renewed I was informed that it wont be renewed and I can appear for interview after my delivery as I am 9 months pregnant and then they will decide after my interview , which will be conducted as a fresh candidate whether to keep me or not.At present they have not given me continuation. What can I do please help me ,I need this job as my husband is also a private employee and I am being thrown out just because of my pregnancy I guess.The Principal o school says whether you have served in this school for 5 years or 15 years it all depends on management whether to keep you or to remove you from the job.Can I do something please suggest.I am feeling so depressed not understanding whether to feel happy that I conceived after 4 years of my marriage and soon I will be enjoying my motherhood or to feel sorry for my pregnancy that I am out from my job.