what could be the reason of improper mensuration cycle?

Hi,
Welcome to ehealthforum,
It is difficult to comment on the cause for the abnormal spotting that you describe without examining you and going ahead with further evaluation. Possibilities of hormonal imbalances, ovarian suppression/failure, anovulatory cycle, pregnancy (if you had been sexually active again without protection) cannot be ruled out. Visit your treating doctor/gynecologist at the earliest for further evaluation to look for the underlying cause, and get started with appropriate treatment measures to help you control the symptoms and regulate your periods. Be in regular monitoring and follow-up with your treating doctor/gynecologist and report any new/abnormal symptoms immediately. Drink plenty of water. Take adequate rest. Maintain healthy diet and lifestyle.
Take care.

Hello mam thanks for your reply.. mam a days after taking abortion pills i went for scan.. in scan uterous was clear.. but dr said if small particles left it can't be viewed in scan but hope fully all would be clear after bleeding.. after scan i had bleeding for anothr 2 to 3 days now when i had spotting after four weeks of abortion i was worried by thinking is some particles may be still left after pills thats why no proper bleeding .. 2ndly i m sure i have not concieved aagain because after my abortion i didn't have sex at all.. so please guide me if there is chance of some left particles in uterous and pleae suggest me i sholud go for any medicine or clearing uterous now or should i wait for some more days ?