There might be such a fanfic out there, but it's not something that is commonly talked about. The 'Loud House' is mainly a family - oriented show, and a plot like Luna being pregnant would be a very different take. If it exists, it would likely be part of a more niche or alternate - universe type of fanfic. You could search for it in the more extensive fanfic communities, but don't be surprised if it's difficult to find.
I'm not sure if there is a specific 'Loud House Luna pregnant' fanfic available. Fanfics can cover a wide range of topics and interpretations within the 'Loud House' fandom, but this particular theme might be quite rare or not conform to the general family - friendly nature of the show. You could try searching on fanfic - specific websites like Archive of Our Own or FanFiction.net, but keep in mind that not all content on these sites may be appropriate or in line with the show's intended audience.
I haven't come across a 'Loud House Luna pregnant' fanfic myself. However, the world of fanfiction is vast. It's possible that some fans with a very creative or different vision of the 'Loud House' universe have written something like this. You can check various fanfic platforms. But also be aware that some platforms have rules about the type of content they allow, and this kind of plot might not be in line with the family - friendly image of the original show.
Chapter 216, ", The First High-Ranking Official to be Dismissed in the Alliance", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter turns that into something concrete by moving from Speaking of this matter, the relevant technological blueprints had... to Finally, unable to endure it any longer, he lifted a document in his....
Chapter 372, ", State Religion Also Needs Alliance Control", is the clearest early answer because a shaky connection becomes usable in the plot. The chapter turns that into something concrete by moving from The reforms in Korolya continued to progress. to The most important aspect was their influence over the hearts of the.... What makes it stick is that the chapter closes with Gu Hang believed that this might truly be The Emperor's blessing.
Chapter 348, ", You Must Believe in Our Loyalty", is the clearest early answer because it turns Governor Akuna's situation into a concrete plot event. The chapter gives readers a real answer by opening on This was not Izla Hood's first visit to the governor's palace, nor... and ending on But likewise, he had also offended quite a few people..
Chapter 326, ", I Really Wasn't Meant to Die!", is the clearest early answer because it turns Divine Power's situation into a concrete plot event. The chapter gives readers a real answer by opening on Even if one were to think in this direction, they dare not speak of... and ending on Without their cooperation and the force of twenty million Star Realm....
Chapter 279, ", System Crash", is the clearest early answer because it turns Anat's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Although they had only taken down three bunkers for the moment, Anat... and follows through with A grave challenge had finally arrived..
Chapter 339, ", Fine Gold, Knight and Titan", is the clearest early answer because it turns Heijian Star's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He already had the name in mind, "Alliance National Knights."... and follows through with This chapter is 5.2k words, a thousand more than usual, by way of....
Chapter 249, ", Hold for 8 Days, the Governor Will Arrive", is the clearest early answer because it turns Sentry Mecha's situation into a concrete plot event. Early on, In the past, during the many battles on Rage Owl Star, his troops.... By the end, The dispute arose when Luman told Gu Ming that out of the eight.... Inside the broader faction conflict storyline, the chapter closes with "Hold for eight days.
Chapter 292, ", Imperial Tax", is the clearest early answer because it turns Dragonhawk Star Domain's situation into a concrete plot event. A useful checkpoint is the way the scene starts with A world that should have been rich and beautiful, what a pity, the... and follows through with Left with a mess, subsequent issues either need the various levels of....
Chapter 164, ", The Death of the Military Governor (6k, subscribe please!)", is the clearest early answer because the violence around Green Skins becomes final instead of hypothetical. It opens with Those shrimps actually dared to charge at them. and closes on No sooner had he thought this than he was struck hard..
Chapter 225, ", Two Minutes", is the clearest early answer because it turns Georgette's situation into a concrete plot event. A useful checkpoint is the way the scene starts with He could only continue to stand his ground and say to Georgette, "Yes! and follows through with Luckily, managed to wrap it up before 12 o'clock..