False Pregnancies Test?

Tori
Has anybody ever taken a pregnancy test and it says "negative" but in the end you are actually pregnant? 
I'm a week late today, only spotting no bleeding like my normal period. I'm using the restroom more frequently than normal also my boobs are extremely tender and I use to breastfeed my daughter and now I'm leaking. 
I have taken 3 pregnancy test 
1st- day before miss period
2nd- day of miss period 
3rd- today when husband got home tonight
Any help or advice of what I should do please help me! 
Thank you ladies