Hi snowcloud - I'm so sorry for your loss.
I had an ERPC at the beginning of March (at nearly 11 weeks), and I didn't get my first period for over 2 months. It did seem like forever at first, because as you say, you just want to know.
I was told that following the ERPC it may take up to 2 weeks to do a negative pregnancy test and that it might take around 6 weeks for my period. I know how very frustrating (and let's face it, impossible) the waiting is, but you are still within the suggested 6 weeks so it is quite possible that you haven't ovulated yet.
In my case it took longer as my HCG levels dropped very slowly so my pregnancy tests stayed low, but positive, for about 7 weeks or so. Since your tests are negative, you shouldn't have the same problem and hopefully things will start happening for you soon.
A couple of asides:
I know how raw and desperate this time can be, and it really can start to feel like days are being wasted and nothing is happening quickly enough. I'm sure many of us who have had a miscarriage remember or recognise that feeling. I certainly felt like it was vital for me to be pregnant again immediately.
Now don't get me wrong, DH and I are absolutely TTC at the moment, but after all those weeks of doing positive tests and feeling angry that I couldn't move on and TTC right away, something weird happened. I'd had a scan to make sure that there was no tissue remaining, and I was having weekly blood tests to make sure my HCG levels were dropping, so I knew everything was okay medically - it was just so frustrating. Then somewhere along the line I accepted that it was completely out of my control. I couldn't make my body become ready to conceive by sheer force of will, and I would just have to wait. I am the least patient person I know, but recognising that fact really helped me to relax and let go of some of the tension I'd been carrying around. It made me feel like I could breathe again, and I felt a bit happier in general.
If you do feel that something may not be right physically, then please see your GP. Hopefully they will be able to set your mind at ease. But please remember to take care of yourself emotionally, and to try and find a way to give yourself some breathing space. That doesn't mean that you should stop TTC if you are ready to, just that your emotional wellbeing is just as important as your physical wellbeing.
Best of luck to you. x