I fasted for 2 weeks and now my period has not shown up. i am very regular and yet i have taken three ept's that have all been negative?

Not unusual : Hormonal changes can occur in a number of situations that can disrupt the normal menstrual cycle and cause a woman to skip a period. Some of the known situations I can do this include: rapid weight loss, fasting, severe emotional upset and vigorous exercise. In your case it's likely that fasting is responsible for your period showing up on time.