It just started showing up 2 weeks ago, I'm 33+1, and the high blood pressure started up then as well so I'm spending the day doing a 24-hr urine collection. (I had to do this like 12 times with my first from having protein and high bp from the start and was induced at 37 weeks from both numbers getting very high)
No, it can be certain foods that haven't fully digested properly. It's not a huge concern if you're not having other issues and its minor traces. I've had it turn up in my tests a couple times and my Dr assures me it can happen time to time, especially in pregnancy when your kidneys are stressed.
Have protein(ketones) in your urine means you aren't eating enough, so your body is using up fat reserves as a source of energy, therefore meaning your body is in starvation mode
It means you're not getting enough water