Definitely discuss your lupus and a possible pregnancy with your doctors, but realize that the decision is ultimately up to you. Medications may need to be changed, but many medications you can safely continue to take while pregnant including Plaquenil, prednisone, and Imuran among others.
I had been diagnosed for about 2 years when I decided to get pregnant. For me, pregnancy put my lupus into remission & I felt completely healthy/normal during pregnancy (aside from the typical pregnancy symptoms that most women get at least!). Lupus tends to stay the same for 33% of lupus sufferers during pregnancy, while another 33% get an improvement while pregnant and the last 33% will get worse while pregnant. There's no way to know which camp you'll be in before hand unfortunately....
I did flare a few months after pregnancy but managed to keep on working for a while. My husband is a great help to me, both around the house and with the baby (now a preschooler). Knowing that would be the case helped me in my decision.
You will manage to find a way to make things work if you decide to have children... where there is a will there is a way

Good luck to you whatever you decide is best for you!