hi, i took an ipill on the 16th of may and i got my periods on 24th may which was just 18 days from my last period which was on 7th may. then after my periods ended on 28th may after that we always used protection n never used ipill again but again i got my periods today in 18 days...why am i getting my periods early?...is this becoz of i-pill? please tell me...i always got regular periods like in 25-27 days....why now my periods are irregular?