Help! Ct scan during early pregnancy..

Has anyone had a Ct with contrast during early pregnancy? I’m about 7 weeks now and I have been having a hard time catching my breath, taking deep breaths and overall shortness of breath. The blood work I had done at the ER did show an elevation in D-dimer which could indicate a clot. The recommendation was a chest CT but I declined. I’m worried of what the contrast could do to my developing fetus. I’m worried about radiation. Any personal experience with this? Any advice at all?