I think I may be pregnant. My period was due on 3/23, but I didn't have bleeding until the 28th. I awoke to a spot of blood. Today is the 30th and I have been observing every tampon ( I know I am not suppose to be using tampons). The blood is dark brown/black, scanty, odorless, and stretchy. Someone, anyone, please help... Could I be experiencing IMPLANTATION BLEEDING?