If you are a business owner and have a pregnant employee or don’t know the rights around pregnant employees, I strongly urge you to do some reading as soon as possible. Pregnant employees have the right to be free from discrimination. As an employer and also as an employee – you must clearly understand these rights. There are cases all the time in the news about employers that discriminated against a pregnant employee or an employee returning to work.
Here is a nice concise article for additional information.
http://blog.firstreference.com/2013/05/29/understanding-the-rights-of-pregnant-employees-in-ontario/?