Negative Test, Can I Still Be Pregnant?

Patient: My boyfriend and I have been having unprotected sex for about a week and a half. He’s come inside me on all of the occasions, sometimes multiple times a day. We took a pregnancy test today (6 days before next expected period) and it came out negative. He used to do a lot of drugs in his past, and i’m not sure if that effects anything or not, but am I pregnant even though the test showed negative?

Symptoms: Nausea, dizziness, fatigue

Doctor: