There is a condition known as pseudocyesis, where actually there is no pregnancy
but the patient thinks that she is pregnant and perceives all the changes that occur in a pregnancy.
Your condition seems to be similar. If the sonography
shows no pregnancy then you have to believe that there is actually no pregnancy.
I need to know if you are having regular periods. Do you have any children or do you want to have them? For how long have you been married?
Generally a strong desire for pregnancy leads a person to believe that she is pregnant while she is not.
Hope I have answered your query.