I was spotting for days when I was due for my period, a little afterwards, like at 5 weeks. Then I bled until 8 weeks but I dont think its supposed to last that long. but it was very slight, like spotting for 3 weeks! But at the Dr, everything else was normal. He considered me high risk because of the bleeding, but he did say it might be implantation bleeding though it was a little heavier than he thought it should be. I am now 15 weeks, and all is well.