As a safety precaution when starting yoga, always remember to check with your doctor if you are unsure of a safe level of physical exertion for yourself during the pregnancy. When looking for the right class, make sure to take both the style of yoga and instructor into consideration. Certain styles of yoga are better for pregnant women, such as Ananda, Hatha, Kundalini, and Iyengar, are better for pregnant women as they are more focused on proper alignment of the body and breathing than on a high intensity workout such 200 Hour Yoga Teacher Training as Power or Bikram yoga. If you are unfamiliar with yoga or the specific style of yoga you will be taking, make sure to take a supervised class, at least initially. Good instructors will be able to help you customize your workout to meet your unique needs. Additionally, make sure your instructor is certified in prenatal yoga though an accredited yoga institute.
Regardless of your skill level, make sure to start slow to best understand your bodies capability during this time of change. The best rule to follow when practicing yoga is, if it doesn't feel good, don't do it. As you get comfortable with the asanas, feel free to practice on your own, but again, talk to your instructor to discuss poses that will provide the greatest benefit and that are safe to practice alone. Many yoga books and videos are also available that are focused specifically for pregnant women.