Help,

So I started a new job in January (although I got the job in September) but I’m 12 weeks pregnant I’ve just told my boss over the phone as she doesn’t come into my work as I work In a school as a catering assistant but she was like oh wow congratulations but I need to speak to hr as we may terminate your contract I know I’m on probation for 26weeks well 22 weeks left I just need some advice please, I’m always on time, I stay late to help the other girls out, so if they terminate it what would they say