I recall there being an author who went by the name of Reprobate/Kitt Ott who published some interesting TG pregnancy stories. I have found some of them:

http://preggophilia.com/looking-for-hailey-s-curse-t
http://preggophilia.com/halloween-story-...-mansion-t
http://thechangingmirror.com/phpbb/viewt...=11&t=4860
http://www.tgstorytime.com/viewstory.php...&warning=3
http://www.fictionmania.tv/searchdisplay...?word=1888

Are there more?