Diahoreha is a sign u are close alright, as for being barely able to walk well thats cos ur baby is prob way down now and putting pressure down in that area. As for the constipation, the further on u are, ur body finds it longer to break down ur food and thats whats causing the constipation. Oh the joys! Ur almost there, it wont be long! Best of luck
Diarreha & stomach cramps is a sign of labor.