Any Fever ever 100 can be dangerous for the baby I'd go to the er ASAP.
You should go on and get checked out. A headache for that long can be signs of other issues. Plus fever over 101 is dangerous for the baby.
Headaches are normal, and in the first trimester you can have really bad headaches, you can take tylonal, my Dr told me it's safe until the 3rd trimester. Also a cold damp cloth on your forehead, a really dark room, and just relax. I was getting headaches every day, now I'm in my 2nd trimester and they calmed down.
Also if your pillow is too fluffy or too flat that can be causing you headaches or even your mattress. I had to get a mattress pad to add thickness and change my pillow to a memory foam.