I m 23 years old , roughly 110 lbs standing at 5 3 , never been pregnant . My boyfriend and I had sex the day after my menstrual cycle . Lately I ve been feeling tired and weak . Nauseous and bloated . I can t lie down without feeling nauseous as well . I eat small portions and immediately feeling like vomiting after , but nothing comes up . Mild headaches off and on . I ve been getting hot easily even if the room temp is at 60 degrees . My boyfriend doesn t think I m pregnant due to low sperm count . What else could it be ?