First day of work

I am starting work in a new company today. Hamsup told me to report to HR at 8:30am. Someone from HR called me to tell me to report at 9am. So I thought no point going so early at 8:30am, but no harm going earlier, so I decide to go at about 8:45am. Unfortuantely, I estimate the time needed to travel to the company wrongly. I arrived at 8:35am. The HR who's supposed to attend to me has not arrived...