Can Implantation bleeding start at 9 dpo and last for 3 or more days, it started brown spotting for one whole day now at 13 dpo I am still light bleeding. Is implantation bleeding common and what causes so much blood if I am pregnant. I just feel it is more likely since I am trying to conceive that this is implantation bleeding versus all of a sudden I start my period 5 days early when normally my luteal phase is 14 days and has been forever, give or take one day. I am still testing at home and the preg tests are neg, I hate to make an appt with my dr if I am not preggo just to look stupid. If this is an early period it is so weird, usually I have excessively heavy cramping and they are so painful but I havent had hardly any cramping since 9 dpo, plus I know we did it the day of ovulation, the day before, and 3 days before. This is our 7th month of trying and I am 26, I have two healthy children already but dont recall if I had implantation bleeding with my first two cause I wasnt trying so I didnt find out til I was 3 months both times. Can you please help me, if this is implantation bleeding when can a test at home turn positive if I use the sensitive 20miU?