wow!

A delay of 4 days is average. The period cycle is affected by many factors, and even slight stress can affect when your period starts. Delayed periods often occur in girls with an eating disorder or after a flight, a long trip, taking certain medications. If the test is negative, I don't think you should worry, but if you are concerned about it, you should buy another test to see if the previous one is right or wrong. You can read more about the test and the delay on mother.com. And if it turns out that your test is positive - congratulations!

Tests can sometimes give errors, just like PCs. Try another test.

Are blue dye test less accurate? 4 days late on my period and negative pregnancy tests…could my HCG levels still be too low? Normally I am regular