Their relationship would likely deepen. The impending arrival of a baby would bring them closer together on an emotional level. They'd have to communicate more about their hopes and fears for their family. For instance, they might have long talks about what kind of values they want to instill in their child.
Another plot could involve them preparing for the arrival of the baby. They could be seen shopping for baby supplies in different alien markets. Quill would be clueless about most things, while Gamora has a more practical approach, leading to some comical situations.
"Criminal Law of the People's Republic of China" article 20 provides for the situation of justifiable self-defense. According to this article, in order to prevent the country, the public interest, the personal, property and other rights of the person or others from being violated, an act taken to stop the illegal violation and causing damage to the person who violated the law is considered justifiable defense and shall not be subject to criminal responsibility. This means that under legal circumstances, individuals can take necessary actions to protect their own or the rights and interests of others without incurring criminal responsibility. However, if self-defense clearly exceeded the necessary limits and caused significant damage, criminal responsibility may be incurred. In addition, defensive actions taken in the context of violent crimes that seriously endanger personal safety, even if they cause casualties to the wrongdoer, are not considered excessive self-defense and are not subject to criminal responsibility.
Gamora's fate varies in different comic arcs. Sometimes she meets her end, but her story often has complex twists and turns. In some cases, her death is part of a larger narrative development or a sacrifice for a greater cause.