Why is my period late? I am 5 days late on having my period not pregnant and have not taken birth control for years. My period has always come between the 8-10. I have had cramps, sensitive breast as though I do have my period but it has not come. About 6 months ago I had a pap and they found abnormal cells. It came out to be nothing but I do have to have a pap every 6 months for the next 2 years. Could this have any effect if so why did it take 6 months before it effected my period?