I'm sorry to hear you're bleeding. I think it's worth going to the GP in order to get the miscarriage 'documented' in your notes if that makes sense. Some (admittedly callous) doctors will refuse to believe that you've had one and try to convince you that it's 'just a late period'. I'm sure that they do this just so they don't have to go to the effort of refering you for tests.
In my experience (3 miscarriages - 11 weeks, 6 weeks, 6 weeks) I was able to get the last two documented by having a blood test for beta HCG on both occasions. The results showed that I was pregnant, but that my levels were too low for viability. Had I not done this, I'm not sure I would have got a referral to the recurrent miscarriage clinic after my third.
I agree that if the pain and bleeding persist / get worse / you get shoulder pain or any unilateral discomfort then it's important for you to rule out an ectopic.
In terms of how long to expect the bleeding to continue in a normal (non-ectopic) miscarriage at this stage, I found that I bled for one or two days longer than an average period, and somewhat more heavily. After this my cycle actually righted itself quickly and I was able to try again the next time I ovulated. I know that many people say 'wait three months' but there's really no evidence for this with an early loss, besides allowing time for psychological recovery. After my 3rd loss was confirmed, I ovulated 17 days later and conceived my DD.
Again, I am very sorry for your loss and hope that a sticky pregnancy is just around the corner.