constipation while on hospitalized bed rest?

Alex • Blessed to be mom to our miracle IUGR baby boy! I've never met someone as strong and brave as he is!
So I've taken the colace stool softener twice a day as prescribed. I drink tons of water. I take walks on my floor twice a day (that's as much as I can do). And I even tried to drink prune juice. Also I took miralax as prescribed today. Is there anything else I can do to get things regular?