text: Some of these answers are not correct.  While I WOULD go see your physician because stopping on their own isn't an every day occurance, there is no harm in not having one.  First, they even sell birth control pills called Seasonale which only give you a period every 3 months.  Second there is a decent sized percent of the (female) population who do not have regular periods.  I only know one, but she showed me the medical data.  My friend Robin has a period every 4-5 months and even then it is light.  She's not in PAIN nor has any problems as others suggested.  But I'd still check it out.\nTake care.