I have had protein in my urine since I was in my early 20s. It's never been at a high enough level for the MDs to get overly concerned. I've had testing on my kidneys and everything, and they can't find anything wrong. As far as pregnancy goes, I've also had it in my urine during this pregnancy, but not at a high level. I have had to do 24-hour urine collections a couple of times so he could check kidney function but, other than that, no big deal.