If it's large, you may need to stay in the hospital for several weeks, and the baby may have to be delivered early. If you are bleeding heavily, the problem could be fatal for you or the baby. But with proper medical care, the danger of death is small. Get out of bed only to use the bathroom and to bathe or shower. Do not cook, do other household chores, or use stairs.
Bed rest can be boring and stressful.
Reading, writing, crafts, TV, music, or visiting with friends and family will help pass the time. Remember that resting is important for your own safety and the health of the baby. A healthy diet is especially important in this situation, both to keep up your own strength and give the baby adequate nutrition. Take any medicine your doctor prescribes exactly as directed. If you feel it is not helping, tell the doctor, but do not stop taking it on your own.