I haven't had my periods for 8 weeks now... I can't be pregnant because I've not had sex. I don't really know why I've gone so long without one. Normally I have them every 5 weeks. Should I be worried? What should I do?

There could be any number of medical reasons for not having a period and to try to answer the question in a forum such as this would be foolhardy because this is best left up to a gynecologist to figure out. It may be something very minor and then again it could be potentially serious.I would advise a doctors visit to play it safe.
Best wishes