Tbh if you have a headache you might have covid. It was one of my only symptoms.

It depends if you went in and used the Covid check Partner Symptom Checker how you would answer if you were directly had prolonged exposure to someone
who tested positive. I do know that if you are due for booster but haven’t gotten it you are not considered fully vaccinated. I would call your SM. There are a lot of different scenarios based on different answers. It’s not so simple.