<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi I am 16 weeks pregnant ... I have been to doctors for which I thought I may have water infection but sample checked and no infection ... Feeling totally zapped of energy still have no appetite with dizzy spells and occasional headaches . I have also been extremely thirsty since finding out I was pregnant at 6 weeks  <response>: Hi, I understand your concern. Lac of appetite, dizziness, mild head aches in creased thirst are known effects early weeks of pregnancy due to Raised pregnancy hormoneschanges in blood circulation in pregnancy. It slowly reduces as maternal body gets used to it. The symptoms are added up by original general condition of mother. Factors like anemia lac of food digestion, tendency to catch cold affect. - In case the symptoms are exaggerated long-lasting attention should be given in improvement of the general condition by improving appetite, diet, dietary supplements.- which is usually advised by a gynecologist during routine pregnancy check-ups. Increased water intake is also a sign of pregnancy, because body needs more water these days. You can Chat Doctor. Its good to 