Hi Sarah,
Cymbalta is not recommended for use while pregnant or trying to get pregnant. The best thing to do is to speak to your doctor about what is best for you. You can read about Cymbalta here and specifically about use while pregnant or trying to get pregnant here.
Online resources like Health Central are wonderful places to get the information that will help you ask all the right questions when it's time to see your doctor, however they should never be used in place of a doctor's sound advice.
I hope this helps!
Vicki M