Another plot could revolve around how their friends react. The TARDIS crew, like Jack Harkness, could be both shocked and excited. They might help Rose and the Doctor find a safe place to have the baby. And perhaps there are some species in the universe that see this as a significant event and either try to protect or harm them because of it.
One idea could be that they discover the pregnancy in the middle of an adventure. Maybe they're on a planet with some strange energy that affects the Doctor's biology in an unexpected way, leading to the pregnancy. They then have to deal with the challenges of protecting the unborn child while also facing the usual threats in the universe.
Another idea is that they are in a time - locked situation where they are cut off from the TARDIS. They must rely on their wits and the help of some new friends they make in that situation to survive during the pregnancy. It could also be a chance for Rose to learn more about the Doctor's past as they wait for help.
A possible plot could be that Rose discovers she has some special magical ability related to her pregnancy. For example, she might be able to communicate with the unborn child through a unique form of magic. This could lead to all sorts of adventures as she tries to understand this new power and what it means for her and the baby. Or perhaps there are dark forces that are interested in her unborn child because of a prophecy, and Rose has to fight to protect her baby throughout her pregnancy.
A possible plot for this fanfiction could be that Rose discovers she's pregnant at a very inconvenient time, perhaps right in the middle of a big mission. She then has to decide whether to continue with the mission or focus on her pregnancy. Her pregnancy could also be a symbol of hope in a world filled with danger, and she could be seen as a protector not just of the baby, but of a new future.
A more emotional plot could be that Clara discovers she's pregnant and is initially scared about how the Doctor will react. She's worried he'll leave because he's always been so independent and on the move. But the Doctor surprises her by being overjoyed and they start preparing for a life together with the baby, facing all the challenges that come with it.
One idea could be that they have to deal with the challenges of pregnancy while also facing a new alien threat. The Doctor's knowledge of the universe might help in finding ways to protect Clara and the unborn child during their adventures.
In the fanfiction, Rose's pregnancy could be a catalyst for the Doctor to finally settle down in one place for a while. Maybe they find a peaceful planet where they can build a home and prepare for the arrival of the baby. Their friends from their adventures might come to visit and offer their support. It could also lead to some interesting cultural clashes as they combine their different upbringings and knowledge to raise the child.
One idea could be that the kiss is a moment of realization for both of them. Maybe they've been through a dangerous adventure and in that moment of relief, the kiss just happens. It could be the start of a new chapter in their relationship, where they finally admit their deeper feelings for each other.
A great idea for this fanfiction could be that Rose starts having dreams about their future child. These dreams could give them clues about the baby's purpose or the challenges they will face. The Doctor would be very interested in these dreams and try to analyze them scientifically.
One idea could be that they face challenges from their families who have different expectations for their future. Maybe Rose's family is more traditional and has concerns about their young age and financial stability. Another could be that they discover some unexpected medical issues during the pregnancy, which brings them closer together as they deal with the stress.
Well, perhaps in the fanfiction, the pregnancy could be a catalyst for them to start thinking about their future more seriously. They might start planning a life together off the ship, looking for a place to settle down. It could also lead to some comical situations, like Jack trying to build a makeshift crib in their small cabin.