text: irregular periods? i went two months with out a period bfore and now i have them every two weeks.  i'm 13 and i've had my period for two years already.  should i see a doctor?  what will they do? poor thing :(  every two weeks  i agree, go to the doctor.  there are many girls who have irregular periods.  most of the time it isn't a problem, but there are some things that can cause irregularity.  it also can't hurt to have a checkup, and the doctor can help you regulate your period.