No No No Em, if they are not sure, go back & get a 2nd or even a 3rd opinion. Especially if there is some hope for the little one. Just because they said it MAY be doesn't mean that one is gone, it may be just a bit slower, I know Angel was, Besides if something has developed in the sac then all should not be lost.
I know still having 1 left doesn't change the fact that 1was (may be ) lost & i can only imagine how hard this is for you, but you've gotta keep strong. I really feel for you Em. & NO it's not bloody fair at all.
go & get yourself another scan somewhere else, perhaps with more skills that the Windsor one, & better equipment, if you went to the one near the salvo store then, yeah no wonder they are inconclusive results.

As for me, well AF turned up, all those + tests & all, not happy, but what can I do???? On to cycle3, with DH away building the extensions I dont think I have a chance, LOL, maybe I should wait till we are in our place first. But once I get to O time I cant help myself.