Why Do Pregnancy Tests Fail Can A Urine Pregnancy Test Fail To Detect Pregnancy In Some Women?

Can a urine pregnancy test fail to detect pregnancy in some women? - why do pregnancy tests fail

I know that if you take a test too early, you can register one was false-negative, but I was more than 2 weeks late, and I took four tests all negative. My cycle is usually like clockwork .. Ill know until the day of your departure. I know I could be a possibility that I am pregnant and I was told that some women do not fall pregnant with a urine test. What causes this, and it is rare that a urine test does not work?