2 failed IUI's

just looking for advice and success stories. We have had 2 failed <a href="https://glowing.com/glow-fertility-program">IUI</a>'s (Back to back cycles) and no explanation for infertility. I just feel like if <a href="https://glowing.com/glow-fertility-program">IUI</a> failed how will we naturally conceive or how in the world would <a href="https://glowing.com/glow-fertility-program">IVF</a> ever work? Been TTC for 18 months. No issues conceiving our first 4 years ago. I am in my early 30's & feel that is the reason for the struggle