Is it okay if my girlfriend only has her period every 3 months or so? my girlfriend (18) only has a period every 3 months or so--and she says this last one has lasted 9 days (although they usually last a normal amount of time). this isn't new, i don't thi

That : That is an abnormal cycle and should be addressed. If there is any chance she could be pregnant, then she should take a test. She should consider having thyroid levels obtained. Her weight should be assessed as either too low or too high of a weight can cause menstrual irregularities. Her abnormal menses should have a full medical evaluation.