Pregnant Naturally with #2?

Curious to hear experiences... we conceived on our first <a href="https://glowing.com/glow-fertility-program">IUI</a> after years of trying naturally and unexplained infertility. We are trying now for #2, but not sure how long we should try naturally before going back to our RE. We don’t want to waste a lot of time being in our 30’s. Has anyone experienced infertility with #1 but then was able to naturally get pregnant with #2??