Normal to be this irregular?

So I've had my period 10 years and have always been irregular (periods come within a week of expected date give or take). This last year though I skipped 2 periods completely (not consecutive- one in September & one in April), which has never happened, and they seem to be extending further than the 1 week parameters more frequently. This month for example I was 12 days late. Is it normal to be this irregular?

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