I just adopted an adult female cat from someone who has more of a "farm atmosphere". I didn't know much about the cat and I was pretty concerned about worms. So, when I took her to the vet they did a fecal exam and said that she was perfectly healthy and the fecal exam was negative for parasites. However, I still see little white things on her bottom a few days ago and she keeps throwing up. Could the fecal exam have been wrong? Could it be something the fecal exam just couldn't pick up? I know I'm not imagining things because my husband saw it too... Please help. I really can't spend the money to take her to the vet again unless she really needs it. Not to mention the traumatic car ride!