Sudden headache?

I never had preeclampsia before but that’s the first thing that came to mind didn’t have it with my first but I just got a sudden headache I’m 34 weeks exactly today. I mean it’s not horrible but it is very noticeable and bothersome. No swelling anywhere no vision problems.. what should I look out for? And if it doesn’t sound like preeclampsia anyone know why it was so sudden?