description of your problem is not complete as it fail to specify whether time of periods is irregular or the amount of spotting is not proper, is it associated with pain or not, since when this abnormaity is there, In Ayurveda ashok is the drug of choice to regularise cycle. Take ashoka arisht or female cordial with tab. aloes compound.Many a times anaemia
is also a potent facror for it. If it is there then add cap. ferroliv forte.