Clear blue advanced ovulation worry

Okay so I started testing for ovulation on the 30th because that's when I was supposed to start trying. I took my 3rd test today and STILL got the low fertility circle. So of course, I'm over here freaking out thinking something is wrong with me. Can this be normal?? I still have 7 test strips left. Should I just keep trying? I don't want to scare myself into thinking i have a fertility issue this early on. Some calming world's of advice and help would be appreciated. Thanks everyone!!