first time using ovulation sticks.. help please x

hi i have pcos and been trying for about 6 months it's my first time using ovulation sticks and need some advice please, my period is late and i have just tested again as it is 10-11 days late but had 3 negatives but iv just done another and i'm not sure if there is a very very faint line 😳 but since my period isn't here i'm not sure when i would ovulate if i'm not already pregnant? i have bought the clear blue digital ones where you put it in the holder so i'm hopeing they work any advise needed please thanks x