Wedding Fan Saying Is It Okay For A Best Man At A Wedding To Read His Speech Rather Than Saying It From Memory?

Is it okay for a best man at a wedding to read his speech rather than saying it from memory? - wedding fan saying

I am the best man at my brother's wedding this Saturday and I have a written speech. I'm not a fan of big crowds to speak (probably 70-100 people), and I will not forget what I planned to say. Is there something wrong with reading the speech, I have written? What are the rules for this? Is there one?