Can I take nac-600 while pregnant?

WHY? Why take anything that you don't know what it is, why you're taking it, what it will do to you, or what harm it could cause you or baby -- particularly when you're pregnant. Don't take any chances with any medication unless you doctor tells you it's essential to your, or the fetus's, health.
Yes- it's benefcial. Congratulations! research shows that not only is nac, a type of Amino Acid that supports the liver, perfectly safe but that it significantly reduces the chance of miscarriage! see https://sites.Google.Com/site/miscarriageresearch/supplements-and-miscarriage/n-acetyl-cysteine.