Jupiter is in Gemini now, and is almost done through your 5th (children) house. Actually I just checked the ephemeris, and due to retrograde, you kind of luck out, and you have until about April 29, 2013.
So for sure you will try to expand in this area of your life: children, romance, creativity.
I suggest to take advantage of this, since the next Jupiter transit thru your 5th will be another 12 years.
Regardless, even if you don't get pregnant this year, I don't see anything in your natal chart that would prevent any children to come about. The ruler of your 5th is Venus, and your Venus is fairly well aspected.
I'm not very good with natal chart explanation, but I do see a close conjunction of Saturn and Sun in your 7th (marriage). You will put lots of efforts into partnership, but Saturn may not give you the easiest time in this. Furthermore, due to the conjunction, you may have less self-esteem than average people.
I'm not good with natal. If I get it wrong, let me know.