It is generally safe to consume Ceylon tea while pregnant, as long as it is consumed in moderation. Tea, including Ceylon tea, contains caffeine, which can cross the placenta and potentially affect fetal heart rate and metabolism. The American College of Obstetricians and Gynecologists recommends that pregnant women consume no more than 200 milligrams of caffeine per day. One cup of Ceylon tea contains approximately 60 milligrams of caffeine, so it is important to keep track of your caffeine intake while pregnant. It is also a good idea to speak with your healthcare provider about your caffeine intake during pregnancy.