LATE - NEGATIVE TEST?

You should definitely see a doctor. You may be performing the test and inadvertently contaminating the sample, or there may have been a badly stored batch of tests. I conceived my first child 27 years ago and, although the drugstore pregnancy test showed positive (a new thing then), and the first doctor's test showed positive, I had NUMEROUS negative pregnancy tests from my doctor afterward. He explained it as a higher than normal level of estrogen in my system. I had more tests after my pregnancy was confirmed because I had bleeding at week 12. They did an ultrasound (also a new thing then) to confirm I was really pregnant. I was, and Andy is a grownup now.