I would like to clarify certain aspects, to ensure that we understand the situation properly.
Let's use the example of a pregnant member whose riding is very far. If ever, as of the 28th week of pregnancy, it became very complicated for her, medically speaking, to get to Parliament, she would have to provide a medical certificate justifying her absence from the House, as far as I understand. Basically, the days in the period between the 28th week and the 36th week of pregnancy would be considered sick days. As of the 36th week, they would be considered pregnancy days.
In short, before the 36th week of pregnancy, a member's non-attendance must be justified through medical reasons that prevent her from coming to Parliament. In that case, the individual must provide a medical certificate.