OPK help

My last cycle was 35 days which is unusual for me so I really didn’t know when to start using the opk. This app had my ovulation a few days ago but when I tested it was negative on the digital screen(use clearblue advance). Once I pulled the stick out I noticed there was a faint blue test line(yesterday and this morning). Should I keep testing bc I probably haven’t ovulated yet? I was starting to think I missed my window but could ovulation still be coming since there was the blue test line even though the screen showed negative? Not the best pic but this is this morning