Infection or urinary stones are the most common causes. It depends on what gender you are. If you are a girl, then it could be a menstrual cycle, implantation bleeding, or a number of things. For men, it could be prostate problems. The best idea is to get it checked out by your primary care physician, who might refer you to a urologist. This should be checked out immediately though. It could be a very serious matter.
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It means you should see a doctor right away. You could have an infection, a sexually transmitted disease, or your kidneys could be malfunctioning, among other things. You need to see a doctor.
It probably means you had some internal bleeding or an infection, and you are passing blood clots. If this continues to happen or you notice pain or blood, see a doctor.