I sometimes photoshop pregnant anime girls for my own amusement. Figured I could share them here.I'll link to the original images when available.

Let's start with one that isn't actually pregnancy, but vore... Beware the bear!
http://imgur.com/kVY9hqQ
Character: Akiyama Yukari
Anime: Girls und Panzer
Original: http://www.pixiv.net/member_illust.php?m...d=50817087

Here's unbirth too.
http://imgur.com/bgonSog
Characters: Sawa Azusa, Maruyama Saki, Oono Aya, Sakaguchi Karina, Utsugi Yuuki and Yamagou Ayumi
Anime: Girls und Panzer
Original: http://danbooru.donmai.us/posts/1327028

Now on to the pregnancy ones.

http://imgur.com/j9bD7lF
http://imgur.com/zb8n3SP
Character: Nishizumi Miho
Anime: Girls und Panzer
Original: Screenshot from the anime.

http://imgur.com/Q1FwpZq
http://imgur.com/l9rXjhQ
http://imgur.com/2Xv1k65
http://imgur.com/RcFjLZM
Characters: Nishizumi Miho and Nishizumi Maho
Anime Girls und Panzer
Originals: http://danbooru.donmai.us/posts/1390307, there's also a photoshopped nude version that someone else made and I used for this, but it isn't easy to find.

http://imgur.com/Zpv67RA
Character: Yuudachi
Anime/game: Kantai Collection (KanColle)
Original: http://danbooru.donmai.us/posts/2480698

http://imgur.com/X1q9XSo
Character: Shigure
Anime/game: KanColle
Original: http://danbooru.donmai.us/posts/2063695

The following may require some knowledge of KanColle game mechanics to understand...
(No, KanColle doesn't have pregnancy, I'm twisting the game mechanics to suit my fetishes)

http://imgur.com/UofvObZ
http://imgur.com/dVh75Y3
Character: Fubuki
Anime/game: KanColle
Originals: Screenshots from the anime

http://imgur.com/JmgWgGk
Character: Bismarck
Anime/game: KanColle
Original: http://danbooru.donmai.us/posts/1717956