Good am ,may i ask what is the possible cause of my spottings,ive been first take sofia pills last feb.28 ,first day of my peruod usually my period last for 7 days ,it should be march 6,but instead of no period at all i experiencing spotting,until now,on the 16 of.march i.came back to ob and said stop using the pills ,they change it to norifam ,my first inject was last march 16,the day i.consult to them they suggest to chnge to norifam at inject on the same day to prevent vacant day..but still i experiencing spotting,,what should the best way i do.