This is a stupid trap and you shouldn't get caught in it. The woman is not the inconvenience, the pregnancy is not the inconvenience, it's the fact of having to account for staffing and scheduling that is the inconvenience. It's no less an inconvenience if the government requires parental leave to be offered, it's still an employee being out of the workplace for an extended period of time, shifting of job duties, maybe hiring or training a temp, and all on a schedule out of control of the employer.
There are plenty of things to point to where employers don't value their employees and don't deserve loyalty from their employees. Acknowledging reality isn't one of them.
Without the woman or the pregnancy the there would be no staffing or scheduling problem. or no 'inconvenience'.