Glad you got your goodies, Jacque!
I had a similar experience to yours with OPKs after I had a m/c. Prior to getting pregnant, my OPKs were always stark white until a day or two before O. After the m/c I had a line on them - although clearly not as dark as control - for about 10 days or so in the early part of my cycle.
Since the OPK can detect hCG as well as LH, it could be picking up residual hCG left in your system. That was my theory about it anyway!
Good luck