If you have been practising yoga before being pregnant, then I think you could continue. However, as you have been put on bed rest, really listen to your doctor and also take it easy.
If you are not sure what poses would be right for you as you are pregnant, then perhaps consult an experienced teacher or get a good book on the subject. Many of the poses you may have been used to doing, are not suitable now.
Resting yoga poses with props, ie. bolsters, straps, etc. can help. Just doing a few poses which lengthen the spine, dog pose with head resting on brick, baddha konasana, lying on back with support (bolster), with feet together and knees apart is a really good one for pregnancy.
Also lying with your legs up the wall (on a bolster - buttocks), or use a cushion under the buttocks, and relax your legs up the wall. This simple pose (and all inversions) is good for pregnancy, and helps to keep the baby safe.
As for morning sickness, hope you are over that now. I have also heard that being too yin, eating too many fruits, juices etc. can give you morning sickness. Eat more yang food, miso soup is great.
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