I'm such a worrier

I worry so much and I know that's bad. But I've read multiple reviews online about this. 
I had a tuna fish sandwhich last night, I know everything in moderation...then for lunch the only thing I had at school was a tuna salad thing with crackers and I didn't even remember I ate a sandwhich last night. I am worried now, eating it 2 days in a row. Do you think I'm okay? It was barely any today. Again I'm sorry for being so dumb,  I just worry way too much.