Super shaky, horrible headaches, weak? What's going on😢

Carina • 25 years young. baby #1 born April 11th 2017❤️
I'm 16 weeks pregnant and I've noticed the past couple of weeks i randomly get shaky and my head feels like it's going to explode. I don't have diabetes however, I feel like this happens when I have no sugar intake. My hands are currently shaking as I hold my phone to type this. Anybody know what this could be? Low iron? Help😖