Have you looked in the Index of Tarot Spreads at the top of this forum?
Here's a link: http://www.tarotforum.net/showthread.php?t=31867
Scroll down to post #4 and you'll see a section called 'Women's issues' - there are some pregnancy spreads there.
Thank you Sulis, what I really want is a spread that can predict if it's possible a woman became a mother.
I will try to make some adjustments in one of those spreads