Her friends like Spencer, Hanna, and Emily would likely be there for her. They've been through a lot together in PLL, so they'd probably offer support and understanding.
Another potential antagonist could be a new character. Maybe someone who has a vendetta against Aria's friends and is using Aria as a way to get to them. This new character notices that Aria is tired and weak, so they target her specifically, causing more chaos and confusion in the PLL fanfic world.
Perhaps Aria has been working hard on some sort of project in the PLL world, like a school assignment related to the mystery they are all involved in. She's tired but determined. The fanfic could show her friends rallying around her to support her, and together they start to piece together more clues about 'A' as she rests and regains her strength.
One common theme could be the reactions of the other characters. For example, how her friends in the PLL group handle the news. Another might be how Aria herself copes with the pregnancy, like dealing with morning sickness and hormonal changes.
Aria might become more mature. With the responsibility of a pregnancy, she would have to think more about the future and be less impulsive. For example, she might stop getting involved in some of the riskier adventures in PLL.
The plot might revolve around Aria getting sick as a result of all the stress from the Pretty Little Liars' chaos. Her sickness could be a symbol of how the lies and secrets are taking a toll on her. In the fanfic, we might see her struggle with her illness while also trying to figure out who 'A' is. It could be that her weakened state makes her more vulnerable to 'A's attacks or makes her see things in a different light.
Well, it could be that Aria's pregnancy is a result of a one - time accident. In the fanfiction, she might struggle with the decision of whether to keep the baby or not. Her friends in PLL, like Hanna, Spencer, and Emily, could have different opinions and offer their support or doubts. And then there's the whole thing about how the pregnancy will affect her future, like her education and career plans.
I don't have a specific PLL Aria pregnant fanfiction to recommend. However, you can look for it in fanfiction communities. Sometimes, on Tumblr or Reddit's fanfiction - related subreddits, fans might share or discuss such stories. You can also join PLL - focused fan groups on Facebook where members could potentially point you to relevant fanfiction.
Adventure is also quite prevalent. They are often sent on quests or find themselves in strange situations where they have to rely on each other. For example, they might be exploring a haunted castle or looking for a lost treasure. It adds an element of excitement to the story.
One possible fanfiction could be about how Jason and Aria deal with the unexpected pregnancy. They might face challenges from their families and friends. Maybe they initially panic but then slowly start to embrace the idea of becoming parents.