Why do fans think Britney Spears could be pregnant?

Twitter basically freaked out with the star’s post about feeling under the weather for a month. “Britney girl… your nausea has lasted a month and the only time you feel like this is when you’re pregnant???? Who’s going to tell her?” a fan asked. “I think it’s time to take a PLS pregnancy test,” another tweeted.
Rumors kept churning out tweets, with another commenting, “Britney girl is pregnant. Vomiting every morning for a month…. And she even said she herself never was. feel like this except during pregnancy….”
As the world heard in her testimony when she was trying to end her role as protector, Spears, the mother of two teenage boys, is hoping to have another baby. “I want to be able to get married and have children. Currently, I have been preserved at the management agency that, I cannot marry or have a baby. I’m currently on an IUD so I’m not pregnant,” the pop star proves. I want to have the IUD removed so I can start trying for more children. But this so-called group won’t let me go to the doctor to have it taken out because they don’t want me to have any more children,” she said (via Billboards).
https://www.thelist.com/746526/why-fans-think-britney-spears-might-be-pregnant/ Why do fans think Britney Spears could be pregnant?