Suggest Remedy For Delay In Periods

Hi doctor, i have done MTP, i had taken my oral pill on 16/05/2011,and after 48 hours i had inserted the tablets vaginally, now my concern is i have done my post scan also which says everything is normal. but i have not got my periods still. so am worried.. am i still pregnant or is it normal? if it is normal then when can i expect my next periods??