Confused on ovulation tests !?

Kaitlin

Can anyone with experience with ovulation tests please explain to me why my tests are all over like this with light and dark. My last period started on the fifth and is supposed to start again on the fifth but because of these tests being all over it says my period is not till the 15th now.... what do I go by and how do I know if I've ovulated if so? I see two that are dark so idk if I missed my peak testing. Today I did another ovulation and it was really light so idk how I know if my period is coming. My lower abdomen like from my below button and lower is like bloated i havent even gained weight its just bloated but I dont have any other symptoms.