Hi, I was using an apps to iPhone the mentrual calendar wherein it states my ovulation and my next menstrual flow. I have been using this apps for almost 4 months cause I want to have a baby,btw I was irregular since I get married. My last menstrual flow was June 15, then this July 19, then u have a positive pt. And then I go to a doctor for my check up since I m having a very bad coughing.the doctor held an internal ultrasound , turned out nothing inside, why is that?? Then he told me that bad coughing can cause miscarriage . Is it true? He prescribed me an ambroxol generic name, 1xday for 3 days, and advised me to refrain using airconditioner and electric fan. He also made me to go for a hcg counts yesterday and this Wednesday. The result for yesterday was 434. What does this mean?? Im having uncertainty and feeling uncomfortable. This is my first pregnancy. Thank you!