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As per your history you are suffering from unexplained infertility
. As you are already 34 yrs ( with increasing age and time to conception fertility further reduces ) and have been trying for 3 yrs,you need to be thoroughly evaluated by doing a laparoscopy+ hysteroscopy
. Why Laparoscopy?? sometimes few patients may have minimal endometriosis
or mild adhesions which may affect the function of tubes and leads to infertility. By doing laparoscopy adverse factors if any can be ruled out or treated. Also tubes can be evaluated under direct vision Hysteroscopy is the procedure where inside of uterine cavity
is viewed using a camera and if any pathology found can be treated at the same time. Laparoscopy is a day care procedure where you can go same day or next day morning. Don't get scared. As your doctor already said you can try IUI after laparoscopy because immediately after surgery there is good chance of conception. If 3 IUIs fail after laparoscopy you can go ahead with IVF. IVF can be done directly but you need to undergo hysteroscopy before IVF for the reasons explained above. Trust your doctor.
All the best