Do you mean you are going to have your interview in a month time? If that is the case, then I'm afraid it is too late to include your wife in the dv visa process.
No you're mistaken ammeck09. You can easily add you wife in the process but do so ASAP. I did this also after receiving the 2 NL and interview date successfully so do not worry!!
Your wife has no visa number and they can only start to get one for her once they receive something of your intend to add her to your case.
Send
Cover letter telling you intend to marry with her name and date and place of birth.
add her
DS230 PLUS
official certificate of intend to marriage (or whatever it is called in your country--the official notification that you usually get at the Civil services to start the marriage process with)
This you send d
irectly to your country's Embassy or Consulate, not to KCC, as all your papers have are already in your country.
There should be no reason for them to make your case harder as long as you can proof you know each other for a long time and/or have children together, things like that.
What I did is call my country's Consulate directly and the woman explained that its really a matter of the numbers so you need to let them know. Then there should of course be the wedding asap (we forwarded the date as the numbers are fast this year). Then send the official certificate (or they will tell you to bring the original and a copy at the time of the interview). The woman also mentioned that this happens a lot and clearly I also was confused and did not go about it the best way, but second best which is still okay.
Important is to do it now ASAP with as many official marriage related things as possible.
They also need time to do a background check on your wife so depending on how those things go (e.g. if she has perfect papers, no criminal records and just lived in the country where your case is, that's quick and easy)
You embassy or consulate will tell you the best way to go about this in your case so do call them and explain your case.
If you are only together for weeks, then they might do a more strict interview or want additional proof. That all depends but if you know her a long time, you should be fine. You gave no info on that so thats hard to tell.
For us the adding was no problem as we have children together (except that she explained to me that I should have done it right away with just the paper of intend to marry so he was already added to my case but even adding him after getting the 2NL and interview date, it was fine).
Please ask if you need more help on this but add some info
Bentlebee's answer is only relevant if you met your wife a short while ago, but even so if you are genuine you can get the GC (if the requirements are met) and they tend to also keep up with you afterwards as she will be your dependent, but that I do not know exactly about this. There are plenty of people who know from experience so just listen to those and check what people tell you here.