Sorry for your losses, i also had to go to a reaccurant miscarriage clinic, all of my results came back normal and i have been put on 75mg Asprin, 5mg Folic Acid and 400mg Cyclogest pessary (2wice daily) to help us. hope you get your results soon.
As for this pregnancy, I've actually had 3 early scans, my LMP was 29/11/11 so they did a scan on 12/1/12 (6w+2 from LMP) where they saw something in my womb but thought it might be a water "bubble" that may have indicated another ectopic so they arranged a second scan for 26/1/12 where luckily the thing they saw was my gestational sac, and now inside it was a yolk sac and a fetal pole with a lovely flitter heartbeat measuring at 6w+5, the following day I had a little bleeding so I had a third scan on 6/2/12 where baby was fine and stronger heartbeat, baby then measured as 8w+2, after speaking to my midwife she told me to go by that date as it was the closed to the date according to my LMP of 29/11/11 (if i take into account that my last cycle was 32days, it makes it spot on to the dates i estimated)