Some Glee - focused fan forums might also have threads dedicated to sharing 'glee blaine mpreg fanfiction'. You can join these forums and interact with other fans who might be able to point you in the right direction or even share their own creations.
Another option is Tumblr. There are many Glee fanfic blogs on Tumblr. You can search for tags like #Glee #Blaine #sickfanfiction. Some bloggers also post links to their own fanfictions or recommend ones they've read. However, the search on Tumblr can be a bit more hit - or - miss compared to the other two platforms.
You can find it on fanfiction.net. It has a large collection of 'Glee' fanfictions, including many about Kurt and Blaine.
Another option is Wattpad. Although it has a wide variety of content, you can still find some interesting Glee fanfictions featuring Rachel and Blaine. You may need to do a bit more searching compared to the other two platforms, but it's worth a try.
You can find glee kurt blaine fanfiction on websites like Archive of Our Own (AO3). It has a vast collection of fan - created stories. Just search for 'glee kurt blaine' in the search bar, and you'll get a long list of relevant fanfictions.
Tumblr can be a source as well. There are many 'Glee' fan blogs that share and recommend fanfictions about Kurt and Blaine. Some Tumblr users even create their own short fanfictions and post them. Additionally, you can try searching on Google by typing in specific keywords like 'glee kurt and blaine fanfiction' along with other elements you're interested in, such as 'angst' or 'fluff' to narrow down the search results.
Fanfiction.net also might have some. However, AO3 usually has more comprehensive tagging systems which can make it easier to find exactly what you're looking for. Another option could be Tumblr, where some users might share or recommend such fanfictions, although it's not as organized as the dedicated fanfiction sites.
Tumblr sometimes has posts that link to Blaine Glee gay fanfics. You can search for relevant tags like #BlaineGleeFanfic or #GleeGayFic on Tumblr. However, the content might be a bit more scattered compared to the other two platforms, but it's still worth checking out.
Fanfiction.net is another place to look. There are numerous Glee fanfics there. However, the search might be a bit trickier compared to AO3. But if you dig around a bit and look through different categories related to Glee and Blaine, you might come across some good 'bottom Blaine Glee fanfic'.
Archive of Our Own (AO3) is also a great place. It has a lot of well - written 'glee blaine and kurt fanfiction'. The tagging system there helps you to filter out exactly what you're looking for, whether it's a specific genre or theme related to Blaine and Kurt.
One popular 'glee blaine mpreg fanfiction' is 'A New Beginning'. It explores the relationship between Blaine and other characters in a very unique way after the mpreg situation. Another one could be 'Blaine's Journey' which focuses on Blaine's emotional growth during this special time.