Irregular Menstrual Cycle
If your cycle varies a lot, one month for example being 24 days long and another month 32, and third 28 days long, and there is no pattern to this then you have an irregular cycle.
Some women however find that one month they have a shorter cycle and the next month a longer one, and that it oscillates back and forth. Or it may vary over a three month cycle. Then you have a regular irregular cycle.
A short cycle of around 21 days is problematic as well as being annoying because it means that it can be much harder to get pregnant. However you should still use contraception if you don't want to get pregnant- after all you don't want to take a chance!
Some women have spotting regularly mid-cycle at the time of ovulation. This is usually nothing to worry about, but spotting can be a sign that there is something wrong.
So it's always important to let your doctor know if you have spotting and how often it happens. Just show your doctor your period chart.
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