If you're skipping a month every month and this is your norm, then you may naturally have an irregular period. Talk to your doctor about it. It's not uncommon.
When you say your period is in the "20s" do you mean it always falls near the end of the month? Some women menstruate every 30-31 days and find their periods are always around the same day.
An irregular period is not usually a big concern, so long as your actual period isn't very painful. But again, talking to your doctor about this might ease your mind. [ Kendra_Berri's advice column | Ask Kendra_Berri A Question ]
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