In such stories, a prevalent theme can be the support system. The couple may rely on family and friends for advice and help during the pregnancy. There could also be a theme of dealing with unexpected events during pregnancy, like health scares or changes in the pregnancy plan. It often shows how the couple overcomes these difficulties together and grows stronger as a unit in anticipation of the new arrival.
One common theme could be the anticipation and excitement of starting a family. The couple might be shown preparing for the baby, like setting up the nursery or going to doctor's appointments. Another could be the changes in the relationship due to the pregnancy, such as increased closeness or new challenges.
Well, sometimes in these stories, there could be a theme of sacrifice. The wife might have to give up certain things she loves during pregnancy for the health of the baby. And also, the husband might be more protective, which is also a recurring idea. They may face financial concerns as well, thinking about how to provide for the new family member.