Not sure if I'm pregnant.

Okay so I took a pregnancy test, okay 3. 2 came back with unreadable results and 1 came back negative. Do I wait a bit before trying again or? I'm a bit lost I used the same brand for the 3 I took, I looked it up and a lot of women were complaining that it is faulty. I've spoken to my partner and he says I should wait till I've completely missed my period than try again. What to do?