I'm Five Months In Using Micropil..and My Men's Occur Regularly

I'm five months in using micropil..and my men's occur regularly but it happens Oct 4 was my period so I expect it was Nov.4 my period but it not come ...I take micropil on Oct.18 first pack...because I change the time of taking it it will possible to change my cycle?and I got delayed now and how cant be? my husband and i don't have sex ..it is normal when using pills got delayed?and now decided to stop it.