Could I be pregnant?

I finished my period 3 days ago and Since 2 days ago i have been feeling nauseous and really sick. The night I started feeling sick I started throwing up for a while. next morning felt nauseous but haven’t thrown up since that night but its been a couple of days since I’ve thrown up but I’ve been feeling really nauseous, could I possibly be pregnant? Should I take a pregnancy test? I am 18 btw