Letrozole with no trigger?

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Hi ladies, I'm 34 and TTC #1 for about 2.5 years. We have unexplained fertility but my husband has had high viscosity and some mobility issues but they're borderline. We've had a few chemical pregnancies but nothing sticks. This cycle we're doing 5mg of letrozole cd 3-7 without a trigger. Has anyone used letrozole w/o a trigger? Any success? Did you ovulate naturally on your own?