dont know where this goes but implanon questions

this is my 2nd month on birth control called implanon and everywhere i have researched has said they over months lessen periods and last month my period was 13 days and this month i have only spotted im wondering if this is normal for anyone whos been on it

http://www.plannedparenthood.org/health-topics/birth-control/birth-control-implant-implanon-4243.htm

Here is most of the information you need to know about the implanon.