Fever during first trimester

Hey everyone. First time mom here so wanted your opinions and feedback ony situation. So, for the past few days I've been running a fever which didn't escalate until just yesterday. I called my Obgyn nurse and they highly recommended I go to the ER right away which I did. I went, got a bunch of tests done, saw baby for a bit since they wanted to make sure baby was okay, however they were not able to find the cause of my fever. I registered with a temperature of 103 when I got in and left at 98 so I'm glad they were able to help lower my temperature.

Now I'm stuck with a headache that won't go away. I still get chills here and there but not as bad. I've been taking Tylenol every 6 hours as needed.

Do you have any other suggestion as to help with this headache or even how to handle fevers in the future?