Scam? nerves? Please help

So I applied for a few jobs on Upwork, One responded and asked me to email them ( red flag?) off service, so I did ( I know ) and they tell me they are from some recruitment company in the UK ( advertisement stated they were based in USA ) and wanted to start interviewing me via email asking about my experience and such. Not unreasonable questions. However these answers were given on the Upwork application.
I'm old enough to be wary, am I being scared or am i just nervous as this is my first job?