If the interviewer says "We have other interviews to conduct and then back to you in few days", is it a bad sign to not get the job?
It's not a bad sign at all. If they have more interviews arranged, they wouldn't be doing their job if they didn't interview them. They don't just hire the first person suitable for the job. They hire the best person for the job! This may still be you - or it may be the next person to be interviewed. 

Be patient, and they should let you know one way or the other!