6 weeks and still bfn

I calculated to be about 6 weeks today. I have many signs and symptoms of pregnancy however I got something that seemed like my period, 5 days after my period was supposed to come. This was on the 13th. It was lighter than my period, was not accompanied by any pain or much cramping like usual. And it lasted about 5/6 days. Now I still feel like I'm pregnant because of my symptoms. My stomach is starting to look bigger, I'm very tired all the time, I'm nauseous and have headaches all day for the past few days, threw up from it last night. Heartburn, hot flashes, back aches. Legs are sore. No sore boobs or frequent peeing yet. And took a test last night and it was negative (e.p.t. Brand) . So idk what to think!