Regardless of gender, the preferred pre-conception assessment for each prospective parent is analyzing for nutrient deficiencies, toxins, and infections. Lisinopril rarely causes infertility (see the reference). You should have a sperm analysis first before starting the medication, and again along the way.
I am concerned about why you have hypertension in the first place. Do you have silver fillings (mercury amalgams) in your mouth? (See Houston http://onlinelibrary.wiley.com/doi/10.1111/j.1751-7176.2011.00489.x/full) Mercury toxicity impairs fertility, lowers zinc and selenium levels, and may contribute to immune dysfunction. Have you lived in a water-damaged environment? Are your B vitamins up to speed?
Wish you healthy success in making a lovely baby.