It is not uncommon for women to experience spotting or light bleeding during early pregnancy, including around the fifth week. This can be caused by various factors such as implantation, hormonal changes, or cervical irritation. However, if the bleeding is heavy, accompanied by severe pain or cramping, or lasts for an extended period of time, it is important to consult a healthcare provider as these could be signs of a potential complication. It is always best to seek medical advice and get proper evaluation and guidance in such situations.