Yes, actually. I was counting and checking over and over again and I've just realised that my cycle is now 27 days as opposed to the previous 28 days pre-miscarriage. I did OPK the second month after starting to TTC again and I think the luteal phase is now 10 days. I don't know if that makes any difference to things. Hope someone else can respond to this too.
I had a MMC and ERPC in 2008 and had the same problem. I used vitamin B6 successfully and conceived my DD on the 3rd cycle post-ERPC. Just had another MMC and will do the same if necessary (when my periods eventually come back!). Good luck!