Dizziness while pregnant?

So I have one baby who will be 2 soon and when I was pregnant with him I never got dizzy during my pregnancy. I am now 17 weeks pregnant with baby #2 and I woke up in the middle of the night around 1 am feeling super dizzy. So I just went back to bed and thought I’d sleep it off. NOPE I woke up for school @6 am I was still really dizzy to the point where I didn’t even want to go to school. But I forced myself to go anyways. Around 10am I started feeling a little better but not 100% and it’s now 4:30pm and I still don’t feel normal. Anybody else experience this!??