Probably over reacting but could I be pregnant I just need to know I'm not going crazy haha.

My periods are normal regular came every month the same day cycle 28 days and 4 days long. June 12th was my last normal period. Beginning in July even until now I started to get all the "pregnancy" symptoms (nausea, throwing up, everything under the moon) . July 10th i was supposed to get my period, I only spotted for 2 days it completely stopped a couple days later I started shedding brown blood. August 7th I was supposed to get my period I'm 3 days late, I took a test on Tuesday it was negative. I don't know if it could be stress or it's too early to tell. Any advice? No negative comments please.