Is it possible for me to feel nauseous and not know if I am even pregnant?

I have woken up several days this week and felt nauseous. Today I even vomited. I dont know if I am pregnant yet. I have 7 days before I can test. Is it possible for me to feel nauseous this early on? Im hoping for a BFP! I am 8 DPO today. Thanks for any help!