What is the chance that I got Hepatitis C from using someones razor?

This past weekend I was at a friends ski house. I did not know that her aunt had Hep C from a blood transfusion many years ago. When I was showering, I happened to use a razor in the shower (not sure if it was her aunts, but for the purpose of this question I will just ume that it was her aunts razor). Before using the razor, I sprayed the razor off with Kaboom shower & tile cleaner about 5-6 times and washed it off under the shower head. I then shaved my underarms and bikini area. I know that her aunt showered approx. 15 hours before this the night before ... not sure if she shaved or not. What are the chances of me getting Hep C from this possible exposure?