It is possible that you are experiencing early signs of labor based on the symptoms you described. Back pain, cramping in the lower stomach, difficulty walking, mucus plug discharge, and a hard stomach can all be indicators of impending labor. However, it's important to note that every pregnancy is different and these symptoms may vary from person to person. It would be best to contact your healthcare provider or OB-GYN to discuss your specific situation and get their professional opinion. They will be able to evaluate your symptoms along with other factors such as your dilation progress and advise you accordingly. If they determine that you are indeed going into labor or have any concerns about your pregnancy, they will guide you on when to go to the hospital or birthing center for further assessment and support. Remember to keep track of any changes in your symptoms or if they become more intense or frequent. Stay calm and reach out for medical advice so that you can receive appropriate care during this crucial time in your pregnancy journey.