My menstrual cycle is irregular, but now I'm getting worried I haven't had a period since Oct. 5 2012 I've taken two pregnancy test both resulted negative and no oncoming period signs.

If you took a pregnancy test recently and it was negative, you need to get a blood test to see if you are pregnant. Some women never have positive pregnancy tests. Time to see a doctor.

Polycycstic ovarian syndrome? Hormone test if you have irregular periods anyway. Are you on any different medication, drug use all these things can affect a menstrual cycle are they cheap pregnancy tests? Getone done at your doctors not aware of your age could it be menopause?