3 cm at 36 weeks??

I’m 36 + 2 and found out today that I am already 3 cm dilated. I know that doesn’t necessarily mean I’m gonna go into labor any day, but I can’t help but panic a little bit. It feels really early to be that dilated??? And I’m also nervous of a fast labor (it is also my third baby). Has anyone else experienced this? When did you have your baby and how fast was your labor?