My period has never ever been late my entire life. It comes every 27 days or sooner every month. The only time it has ever been late was when I was pregnant with my 2 daughters. It came on time last month but this month it hasn't come. I have taken 3 pregnancy tests... ALL negative. I'm only 3 days late, but this is very unusual for me. Has anyone ever experienced a false negative or anything similar to this?