15 weeks pregnant if you have been a slight cough generally have little effect on the baby, but if you have been a violent cough constantly then it may have a certain impact on the baby, serious cases may be miscarriage, premature rupture of membranes, pathogenic infections and so on. 1. Miscarriage: During pregnancy, coughing constantly, in the process may lead to an increase in abdominal pressure, if the fetus is unstable, then it is easy to have a miscarriage. 2. Premature rupture of membranes: generally more often in the middle and late stages of pregnancy, due to coughing, negative pressure increases pregnant women may experience premature rupture of membranes. 3. Pathogen infection: coughing is generally due to upper respiratory tract infection or lung infection and other reasons, if there are pathogens and other factors have been present in the pregnant woman’s body, leading to coughing, may affect the fetus. Therefore, if a pregnant woman has been coughing, it is recommended to consult a doctor in a timely manner to identify the specific causes of treatment to avoid delay.