I have had many cycles where it looks like I was gonna O... but then temps drop and it starts again.
Its like my body gears up to O a few times before following through a few times.
I think maybe thats what was going on.... maybe the HSG sp?? effected your temps?? Or maybe you were gearing up to O and it just didn't follow through and then now you are really gonna do it?
Usually if you are gonna have faternal twins I think the eggs both drop at the same time.
Either way... I will send you some secret twin BFP vibes.