Well, Jean Grey's death in the comics has multiple scenarios. One common cause was her inability to control her immense psychic powers, which led to her demise. Another time, she might have given her life to protect the world or her fellow mutants.
Yes, there are likely some out there. You can try searching on fanfiction websites like Archive of Our Own. They have a vast collection of fan - created stories, and with the popularity of the Mark Sloan and Lexie Grey relationship, it's possible to find one where they are pregnant.
One great 'Lexie Grey and Jackson Avery Fanfiction' is 'Fragments of Us'. It beautifully captures their complex relationship. The author delves deep into their emotions, showing how they interact in different scenarios within the Grey's Anatomy universe. It's a must - read for fans of the couple.
Archive of Our Own (AO3) is a great place to start. It has a vast collection of fanfictions about Lexie and Jackson. You can search for specific tags like 'Lexie Grey/Jackson Avery' to find the ones that suit your taste.
It could be a story full of emotions. Maybe they're excited about the pregnancy but also worried about how it will affect their careers at the hospital. There could be scenes of them sharing the news with their friends and colleagues, like Meredith and Cristina.
Jean Grey does die in some story arcs of the comic books. However, comic book universes are complex, and her fate can change depending on the writer and the specific storyline.