How would i know if i have enough of a case to file discrimination if i believe i was fired for being pregnant?

i am 7 months pregnant but 2 months ago my workplace stopped scheduling me and hired other people to replace me. when i asked about the schedule all they would tell me was that i wasnt scheduled. i filed for unemployement but it was denied because my work place told them i quit of my own free will. i wish to file an appeal and perhaps file for discrimination but i am unsure if i have a propure case and what i would need to provide as proof. if it matters my workplace and i are both in manatee county, fl. thank you for your time.