Honey, you are not old! I had my first pregnancy when 38 as well. :>)) Many of my friends had their first children later like this too. I had two kids as I had a second child 15 months after the first. They are teens now. Both pregnancies were unremarkable. Give yourself some extra rest, take your prenatal and you should be fine!! Congrats. Was this a planned pregnancy? How are you feeling?
Congratulations! Do you have any specific health concerns that are causing you to think you might have a difficult pregnancy?