In this fanfiction situation, a big challenge could be communication. Vegeta is not the most talkative or emotionally expressive character. So, when Bulma is pregnant and has all these hormonal changes and needs, he might struggle to communicate effectively with her. Also, they may face challenges from the Saiyan - human cultural differences. Vegeta's Saiyan upbringing has different values compared to Bulma's human family traditions, and this could cause some friction during the pregnancy.
One challenge could be protecting the baby from their enemies. Vegeta has made many foes over the years, and they might target the baby. Also, Vegeta's Saiyan nature might make him push the baby too hard in training, while Bulma wants a more relaxed approach. This difference in parenting styles could cause some friction between them.
Robin could face challenges in her relationships. Her friends might have different opinions on how she should handle the pregnancy. Her partner, if there is one, might not be as ready for a baby as she is. For example, if Barney is the father, he has a history of being irresponsible, and he would need to grow up quickly, which could put a strain on their relationship.
Mabel would likely struggle with telling her family. Dipper might be shocked and not know how to react. Her parents could be disappointed or worried. She would also face challenges related to her own future plans. Maybe she had dreams of traveling or exploring more of Gravity Falls, but now she has to put those on hold for the baby. And there's always the fear of the unknown, like what if there are complications during the pregnancy or if the baby has some sort of special condition related to the strange nature of Gravity Falls.
Vegeta might also feel a sense of pride and anticipation. He's been through a lot, and having a child with Bulma is a new chapter in his life. He could start training even harder to make sure he can protect his family, and at the same time, he might have some tender moments with Bulma where he shows his care in his own unique Saiyan way.
One challenge could be dealing with the expectations of others. The Cullens might have their own ideas about how she should handle the pregnancy, and Bella might feel pressured to conform. Additionally, she has to worry about the safety of her unborn child. There could be threats from other vampires or supernatural beings that she has to constantly be on guard against.
She could have physical discomforts like extreme fatigue and morning sickness. Also, she might worry about providing for three babies financially.
She might have physical discomfort and health issues. Also, there could be financial strains and emotional stress.
One challenge could be the threat from dark forces. Harry has many enemies, and they might target his family. Also, they might face financial difficulties as they are still young and may not be fully established in their careers.
Societal and family pressures could be another big challenge. Their families might have different expectations about how they should raise the child. And in the public eye, there could be a lot of speculation and judgment, which can be difficult to handle during such a personal and vulnerable time like pregnancy.
They might face the challenge of not being recognized by their past selves or other characters. Also, they could accidentally change things in a way that creates new and more dangerous villains. Another challenge could be dealing with the technology and power levels of the past, which are much lower than what they are used to.