So I was unsure whether to choose arts/comm @ monash or simply just comm @ melb, but was leaning more towards arts/comm and until like 3hours ago I was pretty sure I wanted to do arts/comm.. I still am but I wanted to leave the option of comm @ melb open. So stupidly I didn't put comm @ melb on my list AT ALL -____-" Because I thought that the order counted so there was no point when they made an offer. So my number 1 preference was arts/com @ monash.
So basically, is comm @ melb totally out of the picture as a potential choice due to my mistake of not putting it as a preference? If it is, I can live with it, but I just wanted to know

Say if I have a major epiphany in the next few weeks and choose not to go to monash is there a chance I could swap into comm @ melbourne and get an offer if I'm above the clearly in, or is that just a nono?
Thanks!