I would also like to add to your suggestion that pregnant women with nausea do twists. Unless she is very body wise, aware, and experienced, there are only two twists I’d recommend to a pregnant woman. One would be Bharadvajasana on a chair and the other would be an easy spinal twist, on the back – Jathara Parivartanasana – but with gently bent knees on rolled blankets placed a foot or so from the hips so the knees can rest easy off the floor without stressing the abdominal area while the Yogini looks out at the opposite side hand. Standing side bends and Trikonasana offer elongated smooth twisting actions and stimulate the abdominal organs too. Babies in the womb seem to like the rocking actions of going in and out of postures as much as stillness, repose, and meditation in the Asana.
From M.