MM, don't worry.  My husband and I are both couple of years younger than you two, and it took us 11 month to get pregnant!  I almost gave up, and made an infertility consultant appointment at the end of the 11th month, and found out that I got it!!  We didn't do anything special for the numerous "baby-making homework", and you just never know!

Be relax and you'll get it eventually.  Good luck!