I usually get my period at the beginning of every month but I didn't get my period last month and so far this month. My stomach, throat hurts I've thrown up two times. Could I be pregnant?

Yes. Another big clue that you may be pregnant is extreme fatigue. You also may experience strong cramping that will last a day and go away only to return about 3-5 days later. This may lead you to believe that they are only mentrual cramps and that your period will soon be on its way but in reality it is due to your uterus preparing for the baby. I would most definitely go an get a pregnancy test if you still haven't had your period within a week or two. Good luck!