Another plotline could involve the baby having some sort of special power. This would add an element of mystery and adventure as they try to protect the baby from those who might want to use its power for evil.
Hermione might be initially shocked but would quickly offer her support. She's always been there for Harry and Ginny, and with her intelligence, she could help them come up with plans to keep the baby safe.
Ron and Hermione could be main characters. They are Harry and Ginny's closest friends. Hermione might offer her vast knowledge of magic to help with any problems the baby has, like if there are some strange magical symptoms. Ron could be there for comical relief, making jokes about how Harry has become a proper family man now.
There could be. The Harry Potter fandom is vast, and fans love to create their own stories. A story where Ginny is pregnant with Harry's baby can explore new aspects of their relationship, like how they handle the responsibilities of impending parenthood in the wizarding world. It might also involve how their friends and family react to the news, adding more drama and warmth to the story.
In some fanfictions, Harry might have the secret power of enhanced mind - reading. He could read not just surface thoughts but deep - seated intentions. Ginny could have the power of elemental control, like being able to manipulate fire in a way that is unique to her. This would add a new dimension to their characters and the story.
It often develops slowly. At first, they might just exchange glances that hold a hidden meaning. Then, they start to find excuses to be near each other more often.
They would become more protective of each other. With a baby in the picture, their love would be deeper as they are now a family. Harry, who has always been a bit of a lone hero, would be more cautious in his actions as he has a family to think about. Ginny, on the other hand, would be more nurturing towards Harry as well as the baby.
A new dark wizard could emerge in the wizarding world. This wizard might be jealous of Harry's fame and power and think that by getting to Lily, he can gain some sort of advantage. He could try to steal Lily's magic or use her to spread fear in the wizarding community.
One possible plot could be that the baby Lily shows signs of having extraordinary magical abilities from a very young age. Harry and Ginny are both proud yet a bit worried about how to guide her. Maybe she accidentally makes things levitate or changes the color of her nursery walls with her magic. They start to introduce her to the wizarding world gently, taking her to visit Hagrid at Hogwarts. And as she grows, they face challenges from the wizarding community who are either overly curious or a bit envious of the family's status.
You can try looking on fanfiction websites like FanFiction.net or Archive of Our Own (AO3). These platforms have a wide variety of fanfiction, and you're likely to find many 'Harry and Ginny baby fanfiction' stories there. Just use the search bar and type in relevant keywords.