What Are Symptoms Of A Miscarriage?

Hi doctor I had my last periods on march 02nd 2015. On the 21st till the 25th had left backpain, slight abdominal pain, headache and cough with little chest pain. Had loose motion for in the morning for 3 days. From the 26th till date I don t have any symptoms and i tested negative today morning with the home test kit.Is this the sign of misscariage or am I pregnant or not.