Sudden pressure in ears followed by headache? Advice?

This morning I felt great and took my dog for about a 15 minute walk. Towards the end I realized I was yawning a lot and had this pressure in my ears like I was descending on a plan. About ten minutes after that a headache set in. Now I’m feeling nauseous on top of the headache.

I’m high risk for preeclampsia, so I do try to take note of my symptoms, but at what point should I call my doctor?

I don’t want to freak out over nothing. I did get my tdap this week so I figured at some point I might feel run down from it so idk what to do.

I’m 31w and 3d.