Hi, I am 12 days late in period. Which is really unusual. I havent missed a period in years. I'm not stressed or anything, and nothing has changed in my lifestyle. I have achey breasts, hot flushes, period like cramps. I've taken 5 hpt but they are all negative. I've taken them all 1st thing in the morning to. I'm jus a little confused. Because this has never happened before. An I would say I know my body quite well. Plz can u help?