I really do think that every woman is different in this case. Some might have very few "negative" affects from the miscarriage or pregnancy loss and might be perfectly fine to concieve before the next period even shows. The lining might be healthy and the egg might just be "asking" to implant. I have heard of many folks who concieve immediately after miscarriage and have absolutely healthy, happy pregnancies.
Then, I really do think that we tried too early. Since my miscarriage and D & C, I have had nothing but miscarriages. I sometimes wonder if I really threw something off in my body and that we should have waited 3 or 4 months before trying again. I wonder if things would have been different. I mean, looking back is always easier to second guess yourself. But I do think that some women might not recover from the "first" (or primary) miscarriage as quickly and getting pregnant too quick might cause another miscarriage or chemical pregnancy. It could be that the lining was not healthy enough, the hormones had not had time to recover, or the body was just not ready.
I think that you should go with your gut on this one. If you really feel you are ready emotionally and feel good physically (didn't bleed for long, sex doesn't hurt, period showed normally, etc), I think you should go for it. If you are really torn or you feel your body is not quite "normal" again, you might want to consider waiting. I do believe that you are the best person to know what your body can handle and what you can deal with emotionally. I don't think any doctor can give you the "correct" answer in this regard.
Good luck with your choice. I really, really hope all works out wonderfully for you (whatever you decide). My thoughts and prayers go out to you