Questions about HCG Trigger shot and follicles

Hi Ladies!!  So my 2nd round of clomid 50 mg ends tomorrow (cd3-9) and my follicle scan is setup for cd 12, next wednesday.  We have been TTC #1 since June 09, got BFP 6/2010 and ended in cornual blighted ovum (very rare) @ 6wks or so.  Finally ready to try again for round 2, but the more research I've done, I've become a little concerned.  My RE is wonderful, but on the last round, she gave me the HcG trigger on cd12 with 2 follicles at 10mm and 12mm.  I've come to realize this isn't normal, most RE won't give trigger until at least one folly is 17mm-18mm.  I wonder if the early trigger could have caused my blighted ovum?  We figured we would try a few months on our own since my cycles have been pretty regular, but nothing, so back to clomid.  Has anyone had trigger shots with follies that small??  And if so, were you able to have a viable pg?  We desperately want to start our family!