Pregnancy Mood Swings..??

Does anyone else in their early first trimester just start laughing and smiling really big for no particular reason? Like my mood swings involve only happy, excited, angry, sad and overwhelmed but it's mostly always happy no matter what. It really bounces between happy and sad. Is this normal? Like I'll just get the urge to laugh really hard for no reason. I'm not complaining but still, haha, I'm curious.