Hello,
You are going the right way in planning an HSG and no, you are not jumping the gun.
Theoretically, infertlity tests are usually advised when a couple has been trying to get pregnant for more than 6 months. But the current idea among most gynecologists is that a couple should be advised infertility tests as soon as they become worried enough to ask for the tests.
Since your wife is ovulating as per records, you need an HSG as well as a semen analysis as the first line of infertility tests.
I hope this helps.
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Experienced in the management of Pregnancy,Infertility,Menopause and all problems in Pregnancy and Gynecology