It's ketones, and is protein excreted in the urine and has to do with poor nutrition, low carb diets, and low blood sugar. It's more of a signal that you need to get more nutrients to yourself and the baby rather than the ketones themself being dangerous. It's really quite common in pregnant women who are really sick with nausea and vomiting.
Not sure what the latter is tbh but I had keytones in most of my tests... Means ur not eating and or drinking enough