Someone HELP!!!!

Michelle
Is it normal to get your period twice in one month??
So my period is normally (6 days) it arrived December 8th 2015 & stopped on the 12th. Then it came again two weeks later on the 29th to January 2nd. 
Could this be a change in my cycle or what? My next period date is supposed to start on the 27th of January to the 2nd of Febuary 2016. Has this ever happened to anyone else???? It's happened to me before but only once. The whole of last year my period came in the beginning of the months now towards the ending. That's just a cycle change right?😕