Hi, implantation bleeding is really hard to judge. I had a full period 2 weeks earlier than I was due which my dr has no reason for other than implantation bleeding. It's really different for each person. I originally thought that I must have fallen pregnant and then the bleed was a miscarriage at only 2 weeks. I was completely shocked to find out that I was pregant. I did the home test 6 times, lol. At least 3 of those tests came back negative and the others positive. I'd wait a week or so and test again. Your dr will be able to do an accurate test for you sooner though. Good Luck I hope you get the result you want.

Best Wishes
Sharon