I just give birth to my twins babies in sunday at weeks 35 1/7, in my case, I feel my legs oedema very much and my tummy seems lower than before,and then start lower back pain also! In Sat. morning, I feel lacking, not much, and when I go take shower, the lacking increase with small amout of blood stain, then we go to hospital and delivery my babies.
That's just experience of mine, sometimes mummy will feel abd. pain that may cause by "false uterus contraction" , if it occurs, don't worry, is normal in your weeks of gestation. Ofcause, if the pain increase or blood stain start, u need consult your doctor asap.