please listen to the doctor and wait for your wife to get better completely. i understand you must be eager for a baby, but more than that, you would want the baby and your wife to be healthy.
high blood pressure can lead to preeclampsia, which is a very serious and even fatal condition. as your doctor has already said he will not take responsibility of something goes wrong, i would suggest you should definitely wait for now.
please read up on preeclampsia and how blood pressure can affect the pregnancy http://www.mayoclinic.org/diseases-conditions/preeclampsia/basics/definition/con-20031644
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