Faint line on a advanced clearblue digital ovulation test

I took this ovulation test this evening and it came back as low fertility a O not a smiley face but when I took out the stick I see two faint lines can someone tell me what this means? Was the digital not reading the faint line just because it was to faint? Do anyone this I should ignore the O and have sex anyways just because it shows two faint lines??? Need in of some help!!!