What breed do you think my mare is?

[midnightbreeze18]

She defiantly has some arabian in her. But i don;t know what her other side is. She is just under 15hh. She is also pregnant. Any ideas? I thought maybe morgan/arabian.

http://s519.photobucket.com/albums/u355/sparkle18_photo/?action=view&current=Penny.jpg