Can't afford my rent- consequences?

This may be in the wrong forum..
But I can't afford my rent payment. It was due a 4 days ago and I still haven't paid it. I do have a week extension as last month I told him I was getting paid on the 7th, which was true last month and I thought I'd have it this month but I have absolutely nothing to my name.
I've only made it worse for myself by telling my parents I had the rent money (I was going to get it together myself as I do some webcamming work but that hasn't worked out well this month) as they had next to no money and my mum struggled to pay me back a small amount of money that she owed me and didn't want to put this burden on them.

I do only have this month and next month left on the tenancy- my mum said she would pay next months and also at some point pay me back for this month (although I've told her she shouldn't). I have some really promising job interest so hopefully I should have also started a grad job by next month, maybe even starting next week. But I just don't have it now.

My real question is, tl;dr:

Since there's no way that I can pay him until next month, what will the consequences be? In terms of my credit rating, potential legal action, getting a new rental place afterwards etc.?

I know this is my fault and should have been more organised and prepared so please spare me the judgement.