Face time hack

Someone named Hudson which is my name, was in a FaceTime with me and my friends and I know it wasn’t a prank, because they would have to do it directly on my phone. It didn’t show any number or email and I was the only one who was able to see it, I fixed it but I don’t know if I should take any further things to insure that this doesn’t happen again. I fixed it by changing my Apple ID and restarting my phone and then it stoped. I am just concerned because that means the hacker would have to target me in order to do this