Personally, I have never done any spread for this concern but I found few info online
You can look up this pregnancy tarot spread it reveals when there would be a pregnancy and what could be the gender of the kid.http://www.tarotforum.net/showthread.php?t=52479
This blog shows how to find out about the gender of the baby:http://www.tarotize.com/2012/02/pregnancy-tarot-spread.html
Now you can always create one! That is what I do when I need something specific. Just think of the info you need and attribute to each card position a specific question or info that you need; something like:
1 - your present situation
2- the potential that you would actually have children
3- is it going along with the purpose of your life journey
4- is there any opening in a near future
5 - the possible outcome
And if card 5 tells you that there is a potential of having kids, then you draw a 6th card that you place by the 5th and that card will reveal the gender.
Of course I have not tested this spread as I have just come up with it while trying to help you
I think the pattern is sound so any time I have a chance to try it i will
Here is about Tarot cards combo that speak on the subject so have to show up in the reading:http://lovedovetarot.com/2012/07/21/16-pregnancy-and-fertility-tarot-card-combos/http://www.tarotforum.net/archive/index.php/t-7071.html
I hope that my response will be of help even if it comes so late...but I've just seen your post (i've been away from the forum for quite some time...); anyhow it might help somebody else...