Well, it depends on how you interpret the story. But in the end, there are clear signs that Chizuru and Kazuya end up together. Their interactions and feelings for each other build up throughout the manga.
Hard to say for sure. Their relationship has its ups and downs, and her feelings for Kazuya aren't straightforward. It depends on how you interpret different scenes and interactions.
During her pregnancy, Chizuru might develop a stronger sense of purpose. Knowing she is going to be a mother gives her a new goal. This could make her more empathetic towards others who are also trying to protect their loved ones. She may also become more patient as she experiences the slow process of bringing new life into the world and realizes that some things cannot be rushed, which is a big shift from her character in non - pregnant scenarios.