Slight bleeding during the 31st week of pregnancy can be concerning, although it may not always indicate a serious problem. It is important to contact your healthcare provider immediately to discuss your symptoms and get proper guidance. Brown discharge could be old blood, but it's still essential to rule out any potential complications such as placenta previa or preterm labor. Leg cramps are common during pregnancy and can often be relieved with simple measures like stretching exercises or warm compresses. However, if the cramps are severe or persistent, it is advisable to consult your doctor for further evaluation. Remember, it's always better to seek professional medical advice when experiencing any unusual symptoms during pregnancy for proper assessment and peace of mind.