with my last pregnancy i also took a bunch of pregnancy test and they all were negative. a month later i went to the dr. office and had another pregnancy test done and it to was negative, so when i mentioned that i had missed a period they did blood work and yep you guess it: negative also. about three months later i took another one and was negative again. i had no sympotms of being pregnant. about a week later i took another test and it was positive. because i had had all of these negavtive test i didn't know when i got pregnant so i had to have a ultrasound and i was about three months pregnant. needless to say this was number 4 four me.