First time

Middle of third week veg, spotted some dark dots on the leaves from one plant, when inspected closely I identified them as spider mites, got immediately to get some pesticide to get rid of them, bought one that said "specifically for spider mites", diluted it in water and sprayed it on the leaves, three hours later some yellow stains appeared on the plant's leaves. I hope it doesn't die, it's the first plague I got, seems like the pesticide was very toxic.