You can start by looking on fanfic platforms like Archive of Our Own (AO3). It has a large collection of RWBY fanfics, and you can use the search function to specifically look for ones where Weiss is pregnant. Another option is Fanfiction.net, but AO3 generally has a more diverse and inclusive range of stories.
Some RWBY fan communities on social media platforms might also recommend good Weiss - pregnant fanfics. For example, on Reddit, there are subreddits dedicated to RWBY. You can post a request there asking for fanfic suggestions related to Weiss being pregnant. People in the community are often quite helpful and can point you to some great reads.
You could also check out Tumblr. There are many RWBY fans on Tumblr who create and share fanfic content. Search for relevant tags like #RWBYWeissPregnantFanfic. However, the quality and content can vary widely, so you may need to do some sifting through the results to find the ones that suit your taste.
Chapter 289, "Off To Velthorne I", is the clearest early answer because it turns Damien's situation into a concrete plot event. A useful checkpoint is the way the scene starts with The celebration in Westmont stretched far into the night, but even as... and follows through with The ground fell away beneath them as they ascended, Westmont growing....
Chapter 259, "Departure I", is the clearest early answer because it pushes Damien into a new phase or setting. The chapter turns that into something concrete by moving from The morning sun filtered softly through the curtains, casting warm... to It was time to return to Westmont—the place where his true objectives.... What makes it stick is that the chapter closes with Daily two chapter updates will resume soon enough once I get well enough.
Chapter 104, "Camp Strength, Rapid Enhancement (2-in-1 Large Chapter)", is the clearest early answer because it turns Iron Refining Furnace's situation into a concrete plot event. The setup is Opening the camp system interface and seeing the data on Wood, Coal,..., but the pressure keeps building through Although there's not much Coal and Iron left, they've managed to....
Chapter 368, "Elias And The Maze", is the clearest early answer because it turns Damon's situation into a concrete plot event. The setup is The arena's spiral gate closed with a hiss, sealing ElderGlow's Year..., but the pressure keeps building through From the crowd's perspective, all was quiet—just floating magic....
Chapter 352, "Milestone Reached", is the clearest early answer because it turns Damien's situation into a concrete plot event. The setup is Summon Luton." The moment the last command echoed, the whole..., but the pressure keeps building through For a brief second, everything halted..
Chapter 249, "Regrouping With Lizella", is the clearest early answer because it turns Damien's situation into a concrete plot event. Early on, Damien moved swiftly, his boots barely making a sound as he.... By the end, Let's get this over with." Fenrir growled in agreement, picking up.... Inside the broader battle storyline, the chapter closes with I am still recovering but you all matter to me too!! Thank you guys!!
Chapter 428, "Damien's Power Was Broken", is the clearest early answer because it turns Damien's situation into a concrete plot event. The chapter turns that into something concrete by moving from Damp stone mixed with charred fur, and the acrid tang of demonic... to Damien walked calmly in its wake, his summons shielding Lyone as they.... What makes it stick is that the chapter closes with Lyone clenched his fists as he walked.
Chapter 53, "Inexplicable Hostility", is the clearest early answer because it turns Rogel Camp's situation into a concrete plot event. The setup is Just as Xia Hong had previously mentioned, the territory of the Rogel..., but the pressure keeps building through As Xia Hong was about to break through the boundary of a thousand....
Chapter 262, "Delayed Travel", is the clearest early answer because it pushes Damien into a new phase or setting. It opens with The Teleportation Center described to Damien loomed before him, a... and closes on That meant he could leave at sunrise and arrive in Ryedale before.... The key payoff is that the chapter closes with And Damien, unknowingly, was about to walk straight into it., which gives technology upgrade a stronger narrative position and pushes the power growth onward.
Chapter 11, "Powerful and Cunning", is the clearest early answer because it turns Snow Mane's situation into a concrete plot event. A useful checkpoint is the way the scene starts with It's certainly not true to say one isn't envious of this Snow Mane. and follows through with Xia Hong pondered for a long time and suddenly thought of something,....