Period and pregnancy symptoms

I just got off my period (09/07/15-09/12/2015) after being 2 days late. Its lasted 5 days and it wasnt as bad as the other cycles but this whole week i've been nauseous, tired, and lightheaded now and then. My mother, grandmother and older sister had a normal period throughout their whole pregnancies and my grandma said is genetics. Could i still be pregnant? Should i test?. Please help!