1 Week late, Clear Blue Digital negative test

I only recently went off BC, so my body may be still working out its kinks. However, I'm a week late now from when AF would have started. I took on CB Digital on Sunday 4/6 and it read not pregnant. Did another this am (4/9) and got another negative. I've been feeling dull cramps for a couple of weeks now, sore boobs (which could be AF coming), and fatigue. Should I do a different test?? I've read digital tests can often be negative when others read positive. Any advice appreciated!