oh Mom15 I'm glad you found your way here, but not glad that you are here. We know the pain.
I have also looked back and wondered if I knew. I didn't feel pregnant the last week before the scan and did worry something might be wrong, but we had also just gotten a terrible diagnosis for our cat so I really wasn't paying much attention to my own symptoms.
I'm not sure why your doctor would tell you to wait two months. MY OB said to wait one full cycle to make dating easier/avoid false positives, but he also told me there was no clinical reason to wait and that as soon as we felt ready we could try again. The only hard stop rule was nothing goes in for at least two weeks to avoid infection, but I think that was because I had a D&C.
The HCG drop time seems to really vary. I finally got a clear negative yesterday, although I did notice a faint line appeared after the test dried for a while. Trying hard not to worry about that! I'm at day 33 since my D&C. I think ricschick's test showed negative after 2 weeks or so? I suppose that isn't helpful, but really I think it is useful to know that everyone is different. My OB told me he won't even worry unless I go for more than 3 months without af showing up. I really hope I don't go that long, but I'm preparing for the long haul.
Is your doctor going to monitor your HCG? Mine didn't, I just used 100s of tests to keep track (I exaggerate, but it feels like hundreds). If you are being monitored they will probably get a good sense of whether or not your levels are dropping appropriately, which will let them know if they need to worry about remaining tissue or not.
I'm hoping things go smoothly for you and that you can get back to trying as soon as possible. Feel free to vent, cry, or share anything else here