康医生:我妻子怀孕后快要度过早孕期了,我听说在孕中期过适度的性生活时,若丈夫把精液射在孕妇阴道内,有引发流产或早产的可能。请问这是怎么回事?该咋办呢? Dr. Kang: My wife is about to get pregnant soon after pregnancy. I heard that when her husband put the seminal fluid in the vagina of her pregnant women during her moderate sexual intercourse during the second trimester, it is possible to induce miscarriage or premature birth. What is going on? What should we do?