Hi Diana,
Change the campaign to look like this:
Smart List
Lead is Created > Form Name: is 'Form Names'
Lead Status > is 'Working'
Flow
1. Wait > Duration: 2 weeks
2. Add Choice: If Lead Status is Waiting, Send Email, Else: Do Nothing
This way the flow will check to make sure that the lead is still in the waiting stage. If you did not add this, it would send the email to all that qualified for the original smart list two weeks prior.