Do you hear back from universities even if you don't get an offer?

I've had offers from three universities, and on my UCAS application page it says that I've heard back from '3/5' like a progress bar. Does this mean even if they don't offer me a place the remaining 2 will get back to me definitively either way? Is there a date by which if I don't hear anything back I should take it that they aren't going to give an offer?