Have any of you taken a pregnancy test and it came out as a false negative?

Just curious as to how often this really happens. Boys if you know of any women who this has happened to feel free to say. If so how long did it take you to realize the negative was false?
Updates:
2Girl Opinion
2Guy Opinion
Most Helpful Guys
Related Questions
What Girls & Guys Said
10The only opinion from guys was selected the Most Helpful Opinion, but you can still contribute by sharing an opinion!
Related myTakes
Click "Show More" for your mentions
Most Helpful Opinion(mho) Rate.
Learn more
Learn more
Most Helpful Girl