Lately I’ve been trying to locate an archive of any of the NSFW pregnancy blogs on Tumblr I used to go on, but I’m not having any luck. Does anyone know if there is a central archive of NSFW Tumblr blogs, and if so, how to locate specific blogs within it ?

Try tumblex

Made a similar post about this a few weeks back, I too have been wondering the same thing. Its a shame it all got deleted, tumblr had some good original content.