Hi Anne, the discarded starter doesn't go "bad" very quickly in the refrigerator, so I wouldn't worry about the safety of using it if it's a little past the week mark, but the flavor will change over time and it can taste a little funky if it's been in the fridge too long. It sounds like your discard is just fine to use!
Barb
June 9, 2019 at 8:18am
In reply to The guide included with the sourdough starter says the 'discard… by Anne (not verified)