implantation bleeding?

started bleeding 11dpo 3 days early af was due today the 15th. 1st day spotting, 2nd day very light flow but on and off all day, 3rd day back to spotting on and off now the 4th day still spotting on and off. like it will completely stop and start back throughout the day!!! I have a very regular 28 day cycle. I never started early. I'm not having clots and I can literally wear a pad all day. have anyone ever experienced this and went on to have a BFP!! if so, how long did it take you to get a positive test?