5 weeks 4 days pregnant

I have been feeling really tired and nauseous for the past week but the past couple days have been rough. I have absolutely no energy, I have a low appetite, which is very unusual for me, I'm nauseous and I can't focus on anything. I get exhausted so easily and have been having light headed and dizziness. Is this normal?? Has anyone else experienced this?? I'm supposed to start a new job soon and I'm worried I won't be feeling well enough. Any suggestions?