I was spotting for the past 2 days a week before I get my period. I've been getting slight headaches, urinatating quit more often then usual and feeling as if I have to pee literally right after using the bathroom. Also, I feel like I'm full all the time like pressure in my stomach. I thought it could be implantation bleeding. So I took a test yesterday morning and nothing, inconclusive. Then I took one a few hours later and read negative. Did i take it too early? Should I wait about a week to retake one?