depends how much, they will have to check for you can be a sign of pre-eclampsia.
Got this of the internet:
At each prenatal visit ask for the results of the urine test. Usually the nurse dips a reagent strip into your urine sample and then waits a minute for the results. The strips have the markings for "trace", 1+, 2+, etc. A reading of trace protein is relatively common and is usually not a cause for concern. If the strip shows a reading of 1+ or greater, it may signify the onset of preeclampsia, even if your blood pressure is less than 140/90. If you have a reading of 2+, call your health care provider immediately.