Take a look at each week of your pregnancy, from conception to birth, with our comprehensive email newsletters. You'll need to activate to enter promotions. Bleeding bleeding while peeing during pregnancy pregnancy is more common than we first suspect. Bleeding while peeing during pregnancy many as one in three women will have some sort of bleeding during their first trimester of pregnancy. This can range from a few brown spots to bright red blood loss and for some, passing large clots. Bleeding can occur at any stage of pregnancy, though it is most common in the first trimester. It is important for women to remember that it is not necessarily a sign of problems.