Negative Result First Day Of Missed Period. False negatives occur because an ovulation period is later than it is supposed to be. Having a follow-up test on a negative result at 21 days shows statistically that most pregnancies can be determined at home.
This is called the variant hook effect. Stuart Spitalnic from Brown University asserts that taking the test too early and not being pregnant are the main reasons for a negative test If you take the test too early then your hCG human chorionic gonadotrophin hormone levels are too low for the test to detect. The most sensitive test First Response Early Result was able to detect more than 95 of pregnancies with its capacity to detect 63 mIUmL.
Wait for a week and then retake a pregnancy test.
OK so you waited until you actually missed your period and the test still came up negative. If you miss this time either by checking too early or too late you could get false results. How is this possible. If no sperm fertilizes the egg a persons period will usually start about 14 days later.