Why do you think you took the right amount of insulin when you didn't test? The only way to find out how much you need is to test. We all need different amounts of insulin to cover carbs, and a lot of us need different amouts of insulin depending on the time of day, so we cannot advise you on how much insulin to take. When I'm afraid I might go hypo I just test more, so I catch the hypo before it's there. With a freestyle libre or a cgm it's much more easy to monitor your levels and to learn what to do for what food, but with finger pricks it's doable as well. Good luck and enjoy your meal!