Hi! I Am 31 Years Of Age. I Was Married

Hi! I am 31 years of age. I was married one and half years ago, i have not yet conceived, it is really worrying me. Even though my monthly periods are regular but short of 23 or 24 days. I beleive my hubby is fine just that he has an asthma, could it be the problem for the delay of my pregnancy? Please Doctor i need your help because am really stressed... Thanks.