I had a risk assessment at work and the policy said that the risk should be evaluated and where it's too great to the mother or unborn child then things should be out in place to reduce it or eliminate it. This can include reducing how much you have to do something or putting you in another job role (at the same pay) where the same risks to do not exist. I work for the prison service tho so a lot of that relates to risk of harm from prisoners. Although, with your clients some of that risk is likely to be the same? Might be worth googling it, do you know anyone else who has been pregnant where you work? Xx