Last week on Monday and Tuesday I had some brown spotting. I should have had my period last Thursday, but still don't have it. For over a week now I have been really tired, naseous, and have had a headache. I took First Response hpt last night, and it said I was not pregnant. Should I retest in the morning? I don't think I urinated on the test long enough. My husband and I always use condoms, but I am not on the pill. Any advice?