question: HI Doctor, I wnet to my gynaec complaning of burning sensation and frequaent stools yesterday. I also had occasional cramps in my stomach wall whih lasted a second or so. I had an episode of vomitting too. Doctor said it is gastroenteritis and gave rantac and a probiotic capsule. APart from this she also prescribed susten 400 mg which is a progesterone tab and said it is to calm the uterus. Is that really required. Pleas eadvise. I am in 18th week of pregnancy