Sick or pregnant? Please comment very nervous

Been having a constant headache for exactly a week tomorrow, and very nauseous, threw up once, I can eat but as soon as I do I feel very sick, I'm always tired and constipation, I guess I've been moody as well (or as my boyfriend says). I'm just confused not sure if I have like the stomach flu or a sign of pregnancy, my sides or where my ovaries are hurt as well, boobs look bigger and are kinda tender, I took a test last Saturday but it was negative, I was also stressing about something, when I took it. Please comment with all opinions. Very nervous