Perhaps in the fanfic, Aria's getting her period coincides with a particularly tense time in the PLL storyline. She could be in the middle of some dangerous investigations, and this new physical and emotional change makes it harder for her to focus. Her friends might notice her being off - balance and try to figure out what's wrong, which could lead to a deeper exploration of female experiences within the PLL universe.
Well, it could be about Aria dealing with the new experience while also handling the drama in PLL. Maybe she tries to hide it from the other girls at first because she's embarrassed, and then as the story progresses, they find out and support her.
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.
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.
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.
It could make Ezra very protective. He might put aside some of his own problems to focus on taking care of Aria. Her friends like Spencer, Hanna, and Emily would also be worried. They might visit her often, bringing schoolwork and gossip to keep her in the loop. But at the same time, they could be distracted from the 'A' mystery, which might put them at risk.
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.
Maybe it could be about how Caleb's sickness affects his relationships in the Pretty Little Liars world. For example, how his friends and loved ones react to his illness, and how he copes with it himself while dealing with all the secrets and drama in Rosewood.
Well, it could be about Allison's struggle with a mystery illness that may or may not be related to the main PLL plot. Maybe she starts getting sick and her friends suspect it's something more sinister, like someone is poisoning her to keep her quiet about a secret.
Maybe it's about how Caleb's sickness affects his relationships in the PLL world. For example, how his friends and loved ones react to his illness and take care of him.
It could be that Aria's creative mind is working overtime. Since she's an artsy person, she might be constantly thinking about her writing, art, or the various events in the PLL story from an artistic perspective. This over - stimulation of her creative thoughts can make it difficult for her to relax and fall asleep.
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.