Hello , My Name Is Nicole. I Am 16 Years

Hello , my name is Nicole. I am 16 years old and I'm wondering if I'm pregnant. I did some thing with my partner on Feb. 12 and I was suppose to get my period on March 7 but it never came. The thing that gets me is me and my partner did not have sex! His area did not enter my body. The only pregnancy symptom I have is feeling a little nauseous. I don't crave any foods and my breast feel and look fine.