Hi Im Using Micropil For 6 Months Im Worrying Because

Hi Im using micropil for 6 months Im worrying because before after 1 pack of micropil I had my period after 3 days but this month its already my 6 days but my period did'nt come. I really don't know what happen. I'm getting worried because I don't want to get pregnant because my daughter is only 4 years old.