Ok I need help/advice

I think I am coming down with the flu. I had my flu shot and every time I’ve had it I never get sick and I guess this years flu shot isn’t helping what’s going around. Anyhow, today the body aches started, headache, now diarrhea and now a slight fever of 99.5 by I know it’s only just beginning as I was fine yesterday. What is too high of a fever when I should go to ER? What is too much for us to take as pregnant woman? I’ve never been sick during my pregnancies like this. Maybe a small cold but I’m literally scared of this thing as it kicked my husbands rear end and he missed a week of work which has never happened. What would u do??????