Is it still possible that I'm pregnant?

honestly i don't think you are if you have any worries consult a doctor but the reason for the line after 9 hours is bc it was left to dry once left to dry an evaporation line can appear so i wouldn't worry about it to much if the others were negative and that one was at first to most test say after 5-10 mins the test results are not conclusive... so during the first 2 to 5 mins thats the correct result! good luck!