Have they done a risk assessment at work for your pregnancy?
From HSE:
Employers should conduct a specific risk assessment on receipt of written notification from an employee that she is pregnant, has given birth in the last six months or is breastfeeding. This must take into account any advice provided by the woman's health professional.
If any risks are identified then employers must take action to remove, reduce or control the risk. If the risk cannot be removed employers must:
Action 1
temporarily adjust her working conditions and/or hours of work; or if that is not possible:
Action 2
offer her suitable alternative work (at the same rate of pay) if available; or if that is not feasible:
Action 3
suspend her from work on paid leave for as long as necessary to protect her health and safety and that of her child.
I would start making noises about that if I were you.