Hi, I Am 26 Years Old Recently Got Married A

Hi,
I am 26 years old recently got married a year ago, my wife got pregnant but we lost our baby while my wife was 6 months pregnant. Since that incident we had sex regularly for 4 months but recently since last 1 week i am not getting erections while preparing for sex, i usually need a bit of physical stimulation to get erect as mental imagination does not get me erect, however since 1 week i am not getting hard erection for intercourse and now i am very concious and nervous to approach my wife for sex as i am afraid that i wont get erection. This has frustrated me and my wife too as we both want to have a baby. Please advice.