oohh thought of another.
if you have left the job go to your local job centre and let them know why are you out of work, take along all your notes.
they will look into the matter and may sue the company for you as its against the law and employment rules.
go and speak to citizens advice in your area they will appoint you in the right direction. if your company has a union, find out who and just ask for general advice. theres loads of advice on the internet, some offer an email service with legal advice - shop around, get free advice and no win no fee.
remember, discrimination against a pregnant employee is a serious no no but sometimes bullying in the workplace can be hard to prove, write everything down including dates as this will form the basis of your case, most employers will settle out of court.
Does anyone know of any good pregnancy soliciters?