Biologists have built up one of the most detailed pictures ever of the changes that occur in women’s bodies before and after pregnancy ... for each test for every week in that period.

“After suffering a brutal, very public miscarriage last November, we were overjoyed to learn we were pregnant. This time, we kept the news to ourselves. But last weekend, once again, 17 weeks in.

a patient who developed a uterine infection at 17 weeks that would have killed her if not for an abortion; and a mother of twins with a life-threatening heart condition made worse by pregnancy ...