8 days late

Patient: I missed my period. It was supposed to start 8 days ago. My boyfriend and i just started having sex. He is the only one I’ve had sex with and this is the first time i have missed a period. He once had gonorrhea 2 years before he met me but he was treated. His sperm count is at none. He has to get a physical often and the doctor says he doesn’t have anything. I have no symptoms of anything. What could be wrong?

Symptoms: Missed period