you SHOULD go and see a doctor, like said above, Allah almighty gave knowledge to humans .....he gave us brain and gave us choices to make our decisions....so make the wise one...Consult with a doctor, and let him/her help u....ofcourse prayers are important too
chk dis page for dua, go thru the whole page...

http://www.ummah.com/forum/showthread.php?181121-Dua-for-infertile-couples

Inshah Allah, may the almighty bless u wid a good child soon :) aameen