Third trimester?

I’ve been having a bunch of symptoms that I don’t know if they are just a normal part of the third trimester or if I should seek medical assistance.

-headache only on right side of head

-dizziness

-nausea

-extreme fatigue

-loss of voice

-period like cramps

And I just have weird feeling that something isn’t right. I’m not really sure what to do I called my OB’s office the other day no one answered and no one called me back. My next appointment is September 3rd. Should I just wait it out? I dint have any bleeding and I’m drinking water religiously.