No, it is not possible to be 5 months pregnant and have a period. This is just due to what is involved in a menstrual cycle. If you had a true period during pregnancy, you would miscarry the baby. It IS however possible to have period like bleeding due to a variety of other reasons. If you are bleeding like a period, you need to be seen by a doctor immediately to get looked at.
yes it's possible happened to my sister in law but to be safe go see your doctor asap it could be something serious until he says it isn't stay in bed don't walk to much only go up and down the stairs 1 time and do no cleaning