I don't know what this fluid filled place is on my scalp, had head has hurt for two weeks. I didn't notice the place untill I left the doc office. I was told at the appointment I have fluid behind my ears. I am 17 weeks pregnant tomorrow.

You . You need to be re-evaluated by your doctor for this. Any complaint can be very serious during pregnancy, and head pain for two weeks needs to be evaluated. Please call your doctor. Please be sure your blood pressure is normal. If you develop worsening headache, fever, light-headedness, vomiting, or weakness, then you would need to be seen sa an emergency.