I had a still birth on may 30,2012. After that I have been trying for 4month but still I am not pregnant. My period is regular. We do sex in ovulation period. But why this happen to me? I had my blood test and screening test. No problem is detected in the test. Please help me. What can I do?

Keep trying, first I am sorry for your loss. But it can take a healthy couple, over a year to conceive, so you will have to keep trying.
* how are you tracking ovulation, are you using body temp meaurements