WI FI NOT CONNECTING SAYS INCORRECT PASSWORD

HI WE HAVE LOST CONNECTION TO OUR WI FI MY SELF WITH THE I POD & THE WIFE WITH HER ANDROID PHONE TRIED NORMAL SOLUTIONS SUCH AS UN PLUGGING ROUTER & REPLUGGING , TELLING MY I POD TO FOR GET WI FI CONNECTION RECONNECTING ALL TO NOAVAIL . WHEN I GO TO CONNECT TO MY NETWORK I PUT CODE IN AND IT KEEPS SAYING IN CORRECT PASS WORD ,AT A LOSS