There is quite a bit of variation in how long it takes for a girl to establish the regular menstrual cycle that most women experience in adulthood. And even after the menstrual cycle matures and becomes regular, this "regularity" may differ greatly from woman to woman. This irregularity can give you a concern because you feel there is something wrong going on.
So, some understanding about the normal variations that occur in early adolescence and young adulthood can help ease some of the anxiety.
The cycles in the early years after menstruation has begun typically are a few days longer than in adults. In addition, the lengths of time for irregularity may commonly be longer in these first couple of years.
During the first two years after a girl begins having periods, up to 50% of the cycles occur without ovulation. By about 5 years after the onset of menses, 80% of the cycles have ovulation occurring within them. Without ovulation, the timing of menstrual cycles is not too predictable which is why periods are so variable during the first two years after they have begun.
There are other reasons why a girl could go for an extended period of time without a period. However, you can see that it is quite normal for a girl to have somewhat irregular periods during the first two years of menses. Barring concern for pregnancy or other health problems that could be a factor in not menstruating, many doctors wait until two periods have been missed before doing any significant evaluation for causes.
The most common causes for missed periods in teenagers are pregnancy, stress, and a condition called polycystic ovaries. I would suggest that you talk to your Mum about this and have her call your doctor to discuss this matter in order that he/she may decide whether or not it is necessary to make an appointment.
Good luck :)
· 1 decade ago