Missing period

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Well i haven't got a period for almost two months and want to know why is that and i forgot to take my birth control pills for a week and i have a appointment on this friday bout that i experience that because when i was 23 years old and now i am going to be 34 years old least then a month and i also took a pregnant test and came negitve. All ready so what is wrong with me and i am so scared and i dont know why is happening to me again