I am almost 21 days late, have taken a test, and it also came back negative. My husband and I are trying to conceive and I was very upset. Although, this seems to be a very common thing that happens with a lot of women. I am thinking my job and lack of sleep may have a lot to do with things, after reading up a bit on the topic. I am still hoping that something positive will result. I plan on going to the doctor and getting a blood test done after testing again in about 3/4 days. Good luck to you too!