Hi, So I Have Never Actually Had Sex But At

Hi, so I have never actually had sex but at a party about six weeks ago this guy tried to and his penis did not go in because I said "no." I have had my period twice since then and took an at home pregnancy test that was negative about a week and a half ago. But, lately I have felt nauseous, fatigued, and a little dizzy after not getting enough sleep or throughout the day. Could I be pregnant?