My period is irregular, yesterday it finally started but it was much lighter than usual and I am not cramping or anything.... After two trips to the bathroom it seemed to have completely stopped. This might seem gross, but if I put something inside myself and check it, the color is bright red and brown... I also took a HPT earlier that day and it showed negative, it is the fifth one I have taken since I thought I was late. My question is, could this be implantation bleeding? I am very worried about this...please help me.