Sister's been told she is pregnant, but we are so nervous and scared it could be something else

My younger sister started bleeding few days after her menstrual period, since it was an abnormal thing to her, she hurried it to a near-by clinic where she was given some herbal medicines to stop the bleeding which was successful the following day; it has been ova few months now, she started complaining of feeling feverish, cold etc ---we therefore rushed her to a near-by clinic and was again given some malaria drugs to take, it worsened her condition, we had no other choice than to rush her to the hospital thus two different hospital, where we were told she is pregnant;she is growing lean, throws up any thing she takes in,she feels nausea all the time and looks to weak......please help us out, we are so nervous and scared something terrible might happen to her. Hoping too hear from you soon.....thanx, Schola Ghana