And also these.... taken from babycenter
1) How can I tell which herbal teas are safe to drink during pregnancy?
Although no U.S. regulations specifically address herbal teas, most of the herbs the Food and Drug Administration (FDA) considers safe for food use are presumed safe for teas as well. For example, teas made from ginger, lime blossom, peppermint, roasted barley, rose hips, and thyme are probably safe to drink occasionally in small amounts while you're pregnant or nursing. However, drinking excessive amounts of any teas can cause health problems for you and your developing baby.
2) Which teas are not safe?
Many of the herbs used for teas, when taken in large or medicinal amounts, can potentially stimulate the uterus and induce miscarriage. These include anise, catnip, chamomile, comfrey, ephedra (called ma huang in traditional Chinese medicine), European mistletoe, hibiscus, horehound, Labrador, lemongrass, licorice root, mugwort, pennyroyal, raspberry leaf, rosemary, sage, sassafras, stinging nettle leaf, vetiver, and yarrow.