7 dats late-brown spotting on day of expected period

Caroline

Period is late by seven days. I had spotting 7 days ago. I took a pregnancy test on the 28th, 30th and today all were negative but I took them at night. First were $1 tests. I need some opinions/advice anything. I don’t know what’s going on. Could they have been negative since taken at night? Only, symptoms I have had is fatigue, hunger and sore breasts and that is it...someone please help! I don’t know what to do. I’m never late.