Negative beta hcg on 07/10/14. ct scan chest abdomen pelvis w/contrast 07/17/14. positive beta hcg on 07/30/14. risk to fetus from ct scan?

Low: There is " watershed" period usually before the woman knows she is pregnant that the fetus is usually protected from harm. Follow-up with your doctor however.

CT scan effect: Radiation in the early stages of pregnancy causes what they call an "all or nothing" effect. That means that it either causes a spontaneous abortion or it doesn't do anything. The theoretical risks are less concrete. Speak to your obstetrician, but it is highly unlikely there will be a problem

Questions: When did you have sex? How high was the beta? If the beta was low and/or you had sex after the 17th, no risk for the fetus. If the beta was high and you had sex before the 17th, then there is some risk to the fetus.