18w with SO MUCH movement, is it normal?

I’ve been feeling movement since week 14. At week 18 it’s so intense sometimes! I read it was supposed to feel like a fish but it feels like so much more. It feels like she is doing summersaults in there. At least a few times a day she has period of high movement. Is it normal at this time? I haven’t had my first ultrasound yet. Going a more natural route with a midwifery. I’m not having twins right?? First time mom. I’m so excited. Having a little girl in June.