Late Period

I'm 9 days late and took a test yesterday which came back negative. could be stress, but should I test again in a few days if it still doesn't come? I don't have any typical symptoms of pregnancy or pms. sometimes occasional cramping and bloating. also, I'm on day 45 when I usually average around 35-37 days. my longest cycle that I tracked using this app was 42 days. I'm not too concerned because of the negative test and no symptoms, but just wanted other opinions. thanks!