Elevated bilirubin

Hello :) I've had a blood test done this mornining and all is fine except for the bilirubin. It is slightly elevated, now i've read that it cancaused by a strenous phycial activity. In the past two days i've travled about 60 kilometers on my new bike which in my opinion is not that much - not strenous. My doctor said that it is probably nothing serious considering that other values came back good.Anyways that it, any input would be much appreciated, thanks in advance :)