My RE also said to wait one cycle, for 2 reasons. First, it is hard to date as right after a m/c you don't really know when CD1 actually is... and he said that that the chance of m/c is very high. For us, he wants us to wait until I have another period and then try. He also mentioned studies that showed waiting more than 3 months has no benefit.
When he started school he said they made you wait a year after a m/c to try again!!!