In october i missed my period and this month i had two periods.. in august i had an abortion and septemeber my period came regular? is it normal?

Not unusual: Shifts in hormonal balance will alter whatever menstrual pattern a woman has experienced in the past and is not unusual, especially in light of your recent TOP. Be reassured that most of these instances are benign and are usually easily treated. Usually, no treatment is necessary for irregular periods unless persistent. You should follow up with your doctor if you are concerned or uncomfortable.