You definitely need to discuss this with your doctor so proper precautions can be taken. Having an outbreak during your pregnancy shouldn't harm your baby, but it depends on if you have an outdbreak during delivery.
I don't have genital herpes, but got herpes zoster (shingles). They did everything to keep me out of labor because if my son had been born during the worst of the outbreak, I wouldn't have been able to hold him or nurse him. My outbreak was across my chest and breast and was hideous. I got semi-cleared up in time when my water broke and my son has no ill affects.
Just be sure to talk to your doctor to ensure you'll have a wonderful and healthy baby.
Best wishes!