Are these symptoms

Obviously I know that I need to take a test to be sure, so when is the right time to take a test since I'm only a week and day after I finished my period. But this whole week has been hell. All of a sudden, I'm waking up stuffed up, I have headaches on and off through out the day. I'm so dizzy, like feeling off balance almost, im exhausted, I barley have energy to relax, and I constantly feel sick without ever actually getting sick. The first time I thought maybe I waited to long to eat. But it's been happening every day no matter how much I eat, or what I eat.... Are these symptoms of pregnancy "? Or something else?