An employer can fairly dismiss a pregnant employee for gross misconduct like theft or violence. However, they must show reasonable evidence of guilt and prove dismissal is a reasonable sanction for the misconduct in question. Most importantly, the procedure must be fair.
However, if you can show your pregnancy significantly influenced the decision to dismiss you, you can bring a claim in the employment tribunal for pregnancy discrimination and, possibly, automatically unfair dismissal.
You need to prove facts from which the tribunal could decide, in the absence of an explanation from your employer, that you were dismissed because of your pregnancy.
Employers rarely admit prejudiced thinking. You need to have a dossier of facts which, taken together, are sufficient to show that your pregnancy contributed to your dismissal.
Nucleus specialises in helping with discrimination cases. If you submitted a claim already, or have been dismissed in the last 3 months, get in touch with us.