May 12 (Reuters) - Canada’s main stock index fell on Wednesday on bets of earlier interest rate hikes and higher bond yields after data showed stronger-than-expected inflation in the United States. * At 9:32 a.m. ET (13:32 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was down 48.68 points, or 0.25%, at 19,225.36. (Reporting by Shivani Kumaresan in Bengaluru)