I've had one so far that's glowed (out of 3) and it's BEFORE the pre-lay shed, not after. This is her before her glow:



and during her glow:


I don't know yet if I'll see a glow with the other two - they are both in shed, but I don't believe it to be their pre-lay shed yet - so I might yet see a glow with both of them as well.