Tiffany, I had a baby at 38 and he was my third child. He was not planned, but I really think that he was meant to be here. I did have mixed feelings when I fell pregnant - I cried for a week - I also felt that I was too old to have a baby, and at times felt that I was a grandmother, not a mother - especially at clinic, when there were 18 year olds sitting next to me, and my hair needed a dye job.
As Mandie and Kate said talk to your gp. Make sure that you are doing this for you, not just your husband, as a child is a lifetime responsibility. At least you will only have about a 4 year gap. There is 6 years between each of mine, and getting up at night is much harder when you haven't had to do it for a looooong time.
Reach for the moon, at least you'll land among the stars.