Millie I am going through a very similar experience to yours. Last period started 4th Jan 2009, ovulated a couple of weeks later, should be 7 weeks 5 days today.
But had a bit of bleeding on Monday night, scan on Wednesday showed a sac sized for 5 weeks. They didn't say whether or not it was actually empty, guess that was irrelevant as it hadn't developed for over 2 weeks.
Same as you I was just sent home to wait to miscarry. I asked about surgical/medical intervention and was told the sac was so small that they couldn't guarantee getting it during an ERPC. I assume this was also the case for you as your sac was also sized for 5 weeks.
This is my first pregnancy and I don't know what's going to happen but from what I gather it varies from person to person. You/I could bleed for a week to maybe three or four weeks at a slowish rate or get a sudden gush and know that it was gone.
I have been bleeding at light period levels since Monday, with some cramps through the week and some pain in that area today. My plan is to stay at home for a few days to see what it does, not knowing whether I'm going to have a sudden heavy bleed.
Do you have a date for another scan in ten days to a fortnight to check how it's gone? I think you should have. If your womb isn't clear at that time obviously further options will be discussed at the hospital, but I would think the likelihood is that at this early stage it will hopefully pass naturally without excessive bleeding.
They told me at the EPU to contact them if the bleeding is unmanageable. Other than that I'm afraid it seems to be a case of waiting it out at home with painkillers and sanitary towels.
As I say this is my first pregnancy so what I say is based just on what has happened to me this week, which sounds so weirdly similar to you.
My sympathies.