I was off sick when I got pregnant - I'd been knocked down, then I got knocked up :) But I was back at work for a long time before I went off on maternity leave. She'd have to be off for a pretty long time and by then she wouldn't be on full pay so I'm not sure what the procedure would be. Maybe she was already pregnant but didn't know and that's why she wasn't well. (I know it's not about a real person, but in theory....)