OPK question

Celeste

This is my third time TTC, but my first time using ovulation tests, since I wanted to make sure I’m ovulating coming off birth control. This is obviously a negative test and I’m on day 13 of my cycle. I have regular 28 day cycles. If I ovulate around day 14 shouldn’t it be darker than this around my fertile window? This was taken in the evening after I held my pee for 4 hours :)