Permission Policies in Workplaces
For a moment, let's forget about the pregnancy. Many offices and workplaces have their "permission" rule either to leave early or come late. This policy is enlisted among their HR policies. When implemented in letter and spirit in workplaces where attendance is marked (entry and leaving) by a punching system, either biometric or otherwise, it takes care of such issues automatically. This policy generally provides for certain permission hours subject to certain limits, say twice or thrice in a month. When availed over and above the limit, it is automatically debited to their leave account per month. In these cases, there are no provisions for emotional angles or reasons. Therefore, pregnancy is a non-issue here. The policy applies commonly to all, both male and female.
On the other hand, where such a policy is not in vogue, requests used to keep coming now and then. In many places, the respective HODs, who are normally given or assume such powers, allow permission for all kinds of reasons and tackle them as and when they arise, depending on the exigencies. Especially when it's not very frequent or regular, it's always possible to accommodate irrespective of reasons. For example, to consult a doctor as per an appointment, visiting the school of their wards, attending some functions or funerals, etc.
In small offices where the rapport among the staff involved used to be very close, it could be easy to adjust among themselves. And these are 'unofficial' permissions. We used to call this French Leave. Whereas cases explained in the post have the potential to evolve like some sort of an HR policy, which will be quoted in such cases in the future as well as a 'precedent'. It's always possible to demand certain facilities or concessions as per 'past precedent', which will be very difficult to deny once established as customary norms. Courts also recognize certain customs, conventions, and precedents which may not be found in rule books.
Furthermore, this involves a longer period, probably extending from the 7th month to say the 9th or 10th month until she delivers and may even extend beyond for childcare, etc. It is well understood that a human touch is necessary to deal with such requests. At the same time, be aware that when you embark on making a precedent, especially for a prolonged period, the HR should weigh the pros and cons of the relaxation policy with an eye on the future, as it would amount to making a fresh rule that has to be followed commonly for all. Enforcing such a thing selectively would invite blame for a partisan attitude of HR.