Begonia Rex "Escargot"

I slashed my leaf in several places and placed it on a pot of compost and pinned it down at the edges with little stones. And placed a small amount of compost in the middle.and placed it in an unheated propagator. The propagator has now been heated for 2 weeks. As of yet no sign of growth, but the bits of leaf that are still visible look healthy enough. I’m planning on changing my compost as not of my chillies have germinated either.