GIRLS ONLY: if my period came more than 40 days after the last one?

After my last period I thought it would be 28 days until my next period... on the day I thought it would come.. it didn't so I thought it was a day off or something but weeks began to pass and I new something was irregular...47 days after the last period is when it came... is something wrong?
GIRLS ONLY: if my period came more than 40 days after the last one?
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