It could also be due to physical exhaustion. Caroline might have been overexerting herself in trying to fight against Klaus' enemies or protect her friends. She could have been running on fumes for a while, and when she finally saw Klaus, her body just gave out from sheer fatigue.
Their relationship could become more intimate as they bond over the baby. They might start to see each other in a new light, with Klaus showing a more tender side and Caroline learning to trust him more deeply.
Caroline as a human in fanfiction with Klaus can create a really interesting dynamic. It allows for exploration of how a human might interact with a powerful vampire like Klaus. For example, she could be a source of light in his dark world, constantly challenging his views.
In some fanfiction scenarios, Peter might be dealing with some sort of internal power struggle. If his spider - powers are evolving or being affected in some way, it could lead to his collapse at school. For instance, if there's a glitch in his powers that causes his body to have sudden energy drains or physical reactions, like collapsing, while he's at school trying to act normal.
In the fanfic, the pregnancy could be the catalyst for them to truly open up to each other. They might share their deepest fears and desires. Klaus could reveal his insecurities about being a father, fearing he'll be like his own father. Caroline could comfort him and they could bond over their hopes for the baby. As the pregnancy progresses, their love could grow stronger, and they could become a more united front against any threats.
He could be in shock at first. Standing there for a moment, not believing what he's seeing. Then, his vampire instincts would kick in and he'd start looking for any signs of what caused her to collapse, whether it's an external force or something internal like an illness.
One possible plot could be that Caroline discovers she's pregnant while in a relationship with Klaus. They then face challenges from the supernatural community who might see the baby as a threat or an opportunity. Klaus would be overprotective, and Caroline would struggle to balance her newfound mother - to - be status with her own desires and goals.
One possible plot could be that Klaus and Caroline initially struggle with the idea of having a baby due to their complex pasts and different natures. But as the story progresses, they start to see the potential of a new life as a way to build a new future together. Caroline might worry about how her friends will react, especially those who have had issues with Klaus in the past.
They could discuss Klaus's relationships. Caroline might mention how Klaus's love for her was different from his other relationships. Hope could then ask about how Klaus was in his relationships before she was born. Also, they might talk about Klaus's family and how his upbringing affected his actions.
Maybe he was poisoned. There could be someone who slipped a harmful potion ingredient into his cauldron without him noticing. It's a common plot device in fanfics to create drama.
Perhaps Caroline initially struggles with the idea of being a single mother. She may consider reaching out to Klaus but then decides against it. As time passes, she discovers new powers within herself because of the pregnancy. These powers help her protect her unborn child from various threats that come her way, and she becomes a stronger and more independent character.