If yo had no calcium hardness present the color would not turn red when adding the indicator. It would stay blue. It just means you have not added enough titrant to reach endpoint.
My suggestion is use a 10 ml water sample, add 10 drps of calcium buffer R-0010, 3 drops of calcon indicator R-0011 and then every drop of EDTA titrant R-1012 would equal 25 ppm calcium hardness instead of 10 ppm. Therefore every 4 drops is 100 ppm so the test will go much faster, particularly when calcium levels are very high.