2 day period

hey guys so I just have a question for you all. Four the last month I have felt like it was my turn (especially since I had started to gain weight), but then at the beginning of November AF showed her ugly head. however even after this I still felt off. I feel nauseous after I eat anything. I took a test and it came out negative. Is it possibly to be pregnant, have had a 2 day period and a negative test? advice?