What Causes Late Period And Abdominal Cramps?

Hi... I had a really bad headache...kinda like a migraine and was really about 2 weeks ago... I kept eating and eating because I was really hungry...finally after my last meal about 10:00pm and 2 yogurts the head ache went away... My period was due in about 4 to 5 days so I attributed it to that; however it is now 2 weeks later and in spite of some slight cramping and a little blood in my discharge my period has not come and I am now 10 days late. The headache has not returned...