will I miss my period on the pill!?!?!?!

This is my third month on the pill and I usually miss my period if I'm not actually on it! But I haven't got my period this month and I am gonna start my new pills on Sunday and I was supposed to get my period yesterday or the day before? I think part of it is because I took the pills at different times everyday and I missed a pill and took them at different times and also took two if I missed them... is that a bad thing? Is that why I don't ahem my period?