TTC- doc appt tomorrow

Julie • #3 birth baby due 12/8/21. Biological children are 11 and 4. Step-children are 12 and 8. All boys!!

I’m 39 and TTC #3. Have an ob/gyn appt tomorrow morning. Been trying a few months without success. Last baby took 3 months. Worried about my timeline because of age. Any suggestions on what to ask or tests to request etc? Go straight for clinic etc?