Not all ads that convert are worth scaling. The key thing is to look for ad campaigns that have a positive return on ad spend (ROAS).
It’s advised to let a new Facebook ad run for at least 3 or 4 days before evaluating if it’s good or not. This is the needed time for Facebook to optimize your ad delivery for the best results. Don’t make any changes to the ad during this period or else you will reset the algorithm.