Tic/Twitch while pregnant?

So I’m currently 32 weeks and I’ve developed a tic or twitch where I’ll nod/jerk my head randomly. I noticed it back in November and then it went away for a long time then started again the past couple months. Just a small movement and normally people don’t even notice it. I’m aware of when I do it but it’s like I can’t stop myself. However it’s starting to worry me. I’ve messaged my OBGYN and we are going to talk more about it at my visit next week. But I was just wondering if anyone else has any experiences with this?