Pregnancy symptoms

I'm a week away from period. And trying to get pregnant. Yesterday I was feeling fine and then I was at work and about 10. I started feeling super sick to stomach, sweating, and dizzy. I ended up having to run to rest room and having diarrhea and so close to vomiting. Then I felt fine 10 minutes later. This morning now I am starting to feel it coming on again. Are these early pregnancy symptoms?