I was let go from my job a month before my contact was up and it was stated rather than carry me through a month of maternity, is this legal?

I'm currently 8 months pregnant and was let go from a job a month before my contract ends. I was told I didn't do anything wrong but wasn't the right fit for the job. It was also stated rather than carry me out through a month of maternity allow me to explore other options. I was asked to resign from the position rather than be terminated so it wouldn't effect my career path later on as a teacher. I was given less than 2 hours to make this decision as the termination would go into effect at the end of the school day 3pm and my meeting was held at 1pm. I wasn't given the opportunity to contact human resources as I had students after the time of the meeting. I was also immediately locked out of all of my school accounts which held information to my insurance, documents regarding school agreements, and a copy of my contact. I was offered insurance until the end of the school year June 30th however in the original agreement I was offered insurance until August 31st.