When all standard reports on both partners are normal after 5 years of trying, the diagnosis is often labelled "unexplained infertility". This does not mean nothing is wrong. It usually means the standard tests do not pick up subtler issues like egg quality, sperm DNA fragmentation, exact timing of ovulation and intercourse, or the receptivity of the uterine lining. The good news is that treatment options are effective even without a definite diagnosis.
Next Steps
A fertility specialist consultation is the right next step. Common next-line steps include ovulation induction with timed intercourse for 3 cycles, then IUI for 3 cycles, and IVF if those do not succeed. At 5 years and your ages, most specialists would recommend moving relatively fast through these stages rather than repeating another year of unassisted trying.
Health Tips
Please do not fall into repeat cycles of the same low-yield treatment without a fresh review. If 3 IUI cycles do not work, the plan should escalate to IVF, not just repeat IUI.