Fertility doctor wants me to terminate my pregnancy

My fertility doctor did a scan yesterday. I should have been around 5 weeks 6 days and HCG levels were at 2500 but he couldn't find anything. No sac. He thinks it might be ectopic and wants me to terminate the pregnancy TODAY. My husband wants me to get a second opinion. It's just so much to take in. Anyone go through this? Did you terminate or wait? What was your outcome?