How many IUI attempts w/ unexplained infertility?

My husband and I have unexplained infertility. All tests come back normal and his sperm results were passing with flying colors. Doctor said last attempt is <a href="https://glowing.com/glow-fertility-program">IUI</a> and 3 attempts then he will push me forward to an <a href="https://glowing.com/glow-fertility-program">IVF</a> doctor. 
Anyone else with unexplained infertility have this work? How many insemenations did you go through before you were pregnant ? 

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