I was suppose to get my period last Wednesday and didn't. Thursday evening we went out with friends and I had a feeling I might start so I put a tampon in which after pulling it out had two tiny spots of pinkish blood. Normally when I start it's like a crime scene. Friday I had no blood until that evening and only enough to need a liner. The blood was pinkish red and some dark red/brown. Still not normal. Saturday I had the same color blood and enough to fill half a tampon and Sunday was the same color except I didn't even fill half a tampon. Monday my liner had a couple dark red brown spots and that evening my tampon had a couple dark brown mucous. Today I had the same dark red brown blood, two spots on a liner. No cramps at all except Friday evening. I've had terrible back pain throughout the past two weeks as well. I took a pregnancy test last Thursday which said negative.