I feel weak and tired, sleep all the time and feel feverish. Might it be pregnancy?

Fatigue. The symptoms which you describe are quite consistent with many diagnoses. Pregnancy is one of many possible things that could be going on. If you think you are pregnant, then you should start by determining when was your last period. If it is late, then that could be the first indication you might be pregnant. The best way to tell if you are pregnant is to undergo a pregnancy test.