Can implantation bleeding last for 7 days?

I was wondering the same thing... mine started 11 days befor my period and has lasted 7 days, it just stopped and my period will start in 3 days. So far I have tested negative for pregnancy as of yesterday. I will be checking again in a few days. Also I am on BC and getting accupuncture. My accupuncturist said some women bleed right through pregnancy, and accupuncure increased blood flow. I have also had quite a bit of cramping in day 2 and 3 of implant bleeding - if that is what it is...

I am so confused right now. Cant wait till Sunday to find out for sure