Hello and welcome to MedHelp's forums. Thanks for the question. It is always best to check with your doctor. While it could be a one time situation and likely is, getting checked out is the wise thing to do. Here are common reasons why someone has blood in urine https://www.webmd.com/digestive-disorders/blood-in-urine-causes#1 If you continue to have the blood, definitely get checked out soon. Let us know if it continues to happen.