Dizziness first trimester?

J

Anyone have really constant dizziness that kind feels like your head is spinning in the first trimester that ended up going away? It’s not when I stand up or in shower it’s sometimes when I’m laying down at night or just sitting or walking around. My doctors are stumped... drinking a lot, eating every couple hours, blood pressure not that low, iron levels good. They think it might just be how my body is responding to the pregnancy. It was my first symptom at 4 weeks. Anyone else ever have something similar to this?