Have you thought that pregnancy might be a reason for you being late?? If you are sexually active then a pregnancy test would be in order. You can still get pregnant while on the pill no matter how perfectly you take it.
Second have you missed or been late taking any of the pill? IF so that could be a reason for it being late.
Also if you have been under alot of stress,lost or gained weight even on the pill that can cause you to be late.
You can also call and talk to your doctor and see what she/he has to say.
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Married 3/25/95
DS 13 yr
DS 8 yr (3+ yrs ttc)
TTC #3 since 01/02
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On pill and late period 
Linear Mode
