Wonderful news for you. How sweet. Enjoy this marvelous time.
Relative to yoga, you will hear some similar feedback for practice during pregnancy and some no so similar. I can share with you some generalities relative to Purna Yoga and pregnancy. However it would be best to be looked after by a yoga teacher well trained in prenatal.
Medical doctors here tend to recommend Yoga without knowing anything about it whatsoever. That fact indicates that they do not have an understanding of what it is or the power it holds.
The practice during pregnancy should be a nurturing practice, gentle, kind. So the student takes care of themselves just as they would care for an infant. Therefore there should be no jaring, jumping, running (this pertains tot he physical practice). Any pranayama should also be calming so please avoid the more fiery, intense pranayam.
The nature of the practice changes in the three trimesters so it’s not pragmatic for me to outline all three - another reason to seek out a trained professional.
In the early part of the pregnancy the mission is containment of the fetus. So open pelvis poses should be avoided while a gentle, energetic mulha bandha is appropriate and helpful. As you progress into the third trimester, the focus is now on opening in preparation for birth.
Throughout, gentle backbends would be helpful to create room for breath around the rib cage, not to mention room for growing baby. There should not be any weight placed on the belly and when coming up from the floor you would roll to the left rather than thr right to keep the baby’s weight off of certain arteries.
Just be gentle with yourself, treating you as you would treat your child and eat very well, staying hydrated and consuming deep leafy greens at any opportunity - though it’s not as simple as this post might make it seem.