Irregular periods after being off of hormonal birth control for a year are not uncommon--the same thing happened to me, which is one of the reasons I went back on the bc (well that and I actually started having regular sex, woo!). Not stressing out is probably the most helpful thing in regulating one's cycle--stress is a major interferer.
You should visit your doctor for an annual exam if you haven't lately and you should also go for a birth control consultation. Otherwise I really wouldn't worry...cycles are fickle, fickle things.
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If I am not better, at least I am different. --Jean-Jacques Rousseau
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