Cramps or kicks?

Ma
I'm officially 15 weeks today. Yesterday I almost was in an accident and have to serve pretty hard. I called my doctor and told them what happened and said I felt okay. They said to call back if I have increased cramps or bleeding. No bleeding, thank the Lord, but I can't tell if these are cramps or not. They feel more like a twitch and move like up or down or back and forth and they're quick. Is it too early to have the baby kick or should I call the doctor because these are cramps? Thanks!