Am 39 weeks today, got up this morning and had a lot diahorrea (sorry tmi). Have been having tightenings approx every 15-20mins since then. Some are stronger and more painful than others. They have not got any closer together but they have been regular throughout the day so far and last a good minute each, sometimes longer. Have had a little more diahorrea once more since this morning (and have felt as though I need to go a few more times, when i get the tightenings). Have not had a show or anything like that. Could this be the start??