Transferee now pregnant. Right to occupational pay

I have been a police officer for 8 years but In September I transferred to another force . I have been here nearly 4 months and have found out that I’m pregnant. I know I will get statutory maternity pay but I am very worried I won’t get occupational maternity pay as I have not worked for this force for a year . Has anyone got any experience of this ? Feel gutted that I’ve worked all my life and I won’t get any benefits due to transferring. Thank you