How far apart are these episodes of bleeding?
A cycle can be a short as 21 days and still be considered normal so it is possible to have two menstrual periods in a month.
However, if we are talking about a big chance in this schedule of bleeding for you or the bleeding is even closer together than this, this is not 2 menstrual periods; this is abnormal vaginal bleeding that has nothing to do with menstruation. That would need to be looked into medically.
Gail