i am 40 weeks today. in the night i kept waking with period type pains but in my back beacuse i was so tierd i managed to keep going back to sleep. this morning i woke up at about 7 with them still its more on 1 side of my back and its constant but every now and again it gets more intense. also every now and again my belly keeps going hard but isnt painfull it feels like some1 is blowing it up with air? i think iv been loosing my mucus plug in bits over the last few days. could this be the start of labour?