As an employer, you have a duty of care to your staff, and there are some extra considerations you need to make for any pregnant employees.
Employees who become pregnant will have different opinions as to when is the right time to tell their employer, depending on their personal circumstances. But once they’ve let you know, it’s your duty to assess the health and safety risk to your employee.
You can review your general risk assessment or conduct a new Pregnancy Risk Assessment (which is best practice). We’d recommend reviewing this periodically - say every three months, for example - and reviewing it if there’s any change in working routine, for example if they are attending an event or changing offices. And if you’re wondering, yes you still need to conduct one if they’re working from home!