Am I Pregnant?

I am two weeks late but took a test last weekend and it was negative. I was more worried because I had dark brown discharge for 3 days but it never had a tint of red. In the past week and a half I have felt completely different. I’ve been extra tired, more moody/sensitive & nauseous. I also have heart burn at night, lost my appetite and when I do eat I eat 5 bites and I’m full, my boobs hurt, and I’ve gotten headaches more frequently this past week... Should I take another test or stop freaking out? Also, if I haven’t turned 18 yet how would I approach going to a doctor to verify before telling my parents? Please help I’m tired of stressing 🙂