First appointment with urology for male infertility - what to expect?

We have been TTC #1 since Decemer 2013. My DH is 29 years old and healthy except for being overweight. We got a negative (low sperm) spermcheck fertility home sperm test. Our urology appointment is coming up in 3 weeks.  We are both pretty nervous. Any suggestions on what to expect? I know he is supposed to avoid ejaculation for a few days before a sperm analysis but the appointment falls right around my (likely) fertile week. He has already said we are not skipping a cycle of trying just for this appointment (the doctor's office has not sent any instructions yet). Any past experience or suggestions would be great!