HELP. Headache that WONT go away

I'll be 14 weeks tomorrow, and I have a headache that absolutely will NOT go away for about a week now. I've upped my water intake (my pee is 100% clear), I've tried massaging, hot showers on my neck, ice, and I've been taking Tylenol daily which doesn't touch it. 
I don't know what else to do?? I don't understand what could be wrong? I am MISERABLE. Any ideas? I'm planning on calling my nurse in the morning but thought I'd come here until then.