Things moving too fast?

So I met this amazing guy a few days ago, went on a date two days after meeting him. He kissed me on this date and we ended up making out a few times. Next day, we go out for dessert and go back to his house to watch a movie. Throughout the movie he would give me a few kisses here and there. It then got a little heated and long story short, we both went down on each other. I don’t regret it at all I think it was amazing. My sister on the other hand thinks I’m moving too fast and told me to slow down. I’m not sure anymore. I’m the moment it felt absolutely right and when I told my sister about it, she made me feel otherwise. Am I moving too fast? Should I slow down? I really like this guy!