Pregnancy tests

Rebecca.
My period was due today and very light light spotting but other then that. Feeling a little crampy but Nada. I took a pregnancy test about 5:15 tonight when I had gotten home. Noticed that my urine was pretty diluted/ not yellow. Test negative 
The test on the box says its 99% accurate. Is it likely that I am not pregnant and it's just late ? Orrrr is there. A better time to test ??? 
Advice welcome and wanted. Thanks