Signs of labor

This might be long sorry in advance but last night I went to L&D for having lower back pain and pressure I found out I was 3cm dilated 90% effaced and they could feel his head. They hooked me up to the monitors to check how everything was going & his heart rate was perfect and I was having consistent contractions that I was not feeling, so since I wasnt feeling them they let me go home until I have more pain. Now I am having (sorry tmi) diarrhea but still not feeling pain, could that be another sign of labor coming on?