Hi,thanks for query.Pain in abdomen more in lower part,coming at regular intervals along with some discomfort and watering or leaking from vagina,points towards labor pain
.Back in later of stage of pregnancy
is common as uterus
has got bulky and its supports are stretched.Left side position is preferred at this time.Still in case of too much trouble you can speak to your doctor and take an analgesic
.Watch for baby movement inside.bye.