Off bed rest.. What yoga to do??

Viya
I had bleeding from 5th week till 7th week. 
Then from 12th week to 14th week i bleeding again and detected that my placenta was low and had hematoma. But in 19th week sonography got to know that placenta has been moved up and was just asked to be on bed rest to be on safer side.
Finally my doctor has asked me to resume yoga , walk andswimming . 
I want to know what exercises and yoga i can do??? Please help.