Get it checked. It could be a clutch issue. There could be issues that you can live with, but clutch problem is not one such. Check it at the earliest. I dont think think noise during shifting to reverse is normal. There can be noise if you do not fully depress the clutch while shifting. If you dont check it on time, you could end up shouting at FIAT for a break down. The car only give only indications. Not the damage always or absence of it.