There is no evidence that the vaccine offered during pregnancy is a risk to pregnant women, the pregnancy or the baby. It is not a live vaccine, so you cannot get whooping cough from it.
The vaccine you will be given has been approved by the Medicines and Healthcare products Regulatory Agency (MHRA). Studies show no risks to pregnancy are caused by the vaccine. The rates of normal, healthy babies are the same for vaccinated and unvaccinated women.
The vaccine is highly effective and has an excellent safety record. Millions of doses are given worldwide.