How to tell if I'm getting sick or if its just pregnancy 😧

For the past couple days I've not been feeling well. It seems different than my normal pregnancy nausea and exhaustion. I just feel off. My body is so tired, I'm nauseous, not much of an appetite, just generally not feeling well. Even though to me it feels different than normal pregnancy, how would I even be able to tell 😖 anyone else feeling like this?