DO NOT USE HERBS WHILE PREGNANT!!!
Some herbs to aid in breastfeeding for the purpose of bringing in the milk supply are OK, but absolutely no more.
Taking herbs while pregnant, in the dosages that are taken during NBE, could very easily affect the development of the child and I have seen studies that say it definitely will. Same with taking them while breast feeding. Avoid herbs until you have weened the child are are dried up for at least 6 months.
Wahaika