Facebook quick filter
Find out the intent of the campaign and map that to the attribution model.
Filter by Facebook and that attribution model.
Look at the ROI, sales, and revenue columns.
Click on benchmark and see how campaigns for the attribution model normally perform for that company.
If similar intent campaigns had negative ROI in a week, at a similar ad spend, and similar clicks & leads, you can hang in there if the similar intent campaign eventually hit ROI positive in a time frame you are comfortable with. Otherwise it might be time to cut bait.
A key factor here is your sales cycle and your customer LTV. If you have high customer LTV, and your sales cycle takes longer than a week, you may find this campaign swing to ROI positive soon. Past performance is the guideline we use.
Assuming your new campaign is "new and improved" you'd like to see better performance or at least equal performance than the past.
If your sales velocity is 2 weeks, you might need to give the ad a few weeks to know the true ROI.
If the numbers or your budget don't allow for that, you can stop the campaign, then re-check the ROI after your typical sales cycle for the leads acquired from this campaign has completed.