2 days period, negative test,pimple on my face and back,backache,gas feeling in my tummy,farting and urinating more often. could i s till be pregnant?

Doubtful: If you are having unprotected sex, then it is possible you are pregnant. If you are to the point that you are late for a period, then a home pregnancy test will be quite accurate in determining this. But there are other things that can throw your cycle off and cause your symptoms - illness, stress, change in diet, infection, thyroid problems. Recheck HPT in a week, and see doc if still negative.