Hi, Thanks for using HCM.. I understand your concern..Peppermint tea is an herbal tea, which means that it is naturally caffeine free and can be enjoyed without the adverse effects of caffeine during pregnancy.It is safe in pregnancy donot cause any misscarriage liko other herbal tea.Having mint tea has a lot of benefits. One of the most common problems that pregnant women face is flatulence and nausea, along with morning sickness. Peppermint tea helps to relieve these symptoms and calms a nervous stomach. It also relieves pregnancy symptoms like cramping. One more reason is that peppermint tea is known to help boost the immune system. Thus, it helps to fight infections and pathogens that may try to bring about an infection during pregnancy. It is full of antioxidants, and protects the body from the harmful effects of free radicals. It helps relieve irritable bowel syndrome, and prevents intestinal cramping. Side Effects are in addition to relaxing your stomach muscles, peppermint tea also relaxes your sphincter, the muscle between your stomach and esophagus. This can cause acids from your stomach to flow back up, making heartburn that can occur during pregnancy worse. Peppermint tea can also interact with antacids, so you may want to avoid drinking it if you take any. hope i have answered your queries.. Good day.