Dizzy at 26 weeks out of nowhere.

I’m 26 weeks pregnant. And I’m laying in bed. But I was sitting up slightly and just watching YouTube. And I’ve been nauseous on and off all day. Which isn’t unusual for me. Because I’ve been nauseous this whole pregnancy. But just all of a sudden got a feeling of dizziness along with a nausea and I drank some orange juice. Still drinking it. And I just ate recently. I just don’t know why I would just all of a sudden get dizzy. especially while I’m laying down already. But now my head kind of hurts. And I’m still kind of dizzy and nauseous. Just wondering if anyone could tell me why this is possibly happening. (P.s. baby is perfectly fine. So I’m not worried about that. He is kicking away. Strong and good)