I had gastro about a week ago and was really worried i was in early labour cause the cramps were very strong. I was put on a drip for about 6 hrs to get rehydrated. The Dr explained that dehydration causes the uterus and bowels to spasm and if left untreated can lead to early labour. So get those fluids into you (hydralyte is good) and get checked about a UTI cause this can also bring on labour. Good luck with it all