If it was cervical cancer you would typically be contacted within two weeks, and it would usually be sooner than that (I was phoned a week afterwards and was asked to go in to see them). Everyone I know who has had a cancer diagnosis in recent years - of any kind - has been told within a fortnight, even though they've usually been told at the biopsy appointment that they'd be informed in 4-6 weeks. Of course, in most cases, this is what happens, because the vast majority of people do not get a cancer diagnosis as the outcome of their loop. If it's nothing to worry about, then you don't tend to get the letter for several weeks, because there is no clinical urgency.
If you had cancer, the protocol which they are supposed to follow (and generally these days they do) is to ring you and ask you to come in to discuss your results. You would never be told in a letter that you've got cancer. Having said that, I want to reassure you that if you get a phone call, it doesn't mean you've got cancer, so don't panic if that happens!
To be honest, the fact that you haven't heard anything after two weeks is a good sign.