I am so sorry to hear about your situation. Cervical dysplasia is always scary (regardless of your age), but you must be feeling particularly concerned right now, given your pregnancy. The dysplasia will not affect your baby, but it does give you extra worries since it's still a few weeks until your baby is due.
It is not uncommon for women to develop cervical dysplasia during or around the time of pregnancy. Your immune system function decreases during that time, giving the HPV a chance to take hold.
I am sure you are scared about the chances of a hysterectomy. I was scared when I had mine at age 37! The important thing, though, is to make sure it's really necessary. Please do not make the decision prior to having a consultation with a gynecologic oncologist. They are the specialists when it comes to female cancers and precancers, and they are extensively trained in the most current medical and surgical techniques. At your young age, I'm not sure your gyn should be making that decision without consulting with a specialist. It's possible that you could be treated again with a cone and that could take care of the problem for you forever. Of course, your kidney doc may weigh in on this decision as well if there is some reason that your kidney disease could impact your immune function.
I see Twina246 has mentioned a trachelectomy in the previous post. A trachelectomy is where the cervix is removed and the uterus is left in place with an "artificial cervix" in place. Some women may opt for that to preserve their future chances of fertility. I know you are saying that you don't want any additional children, but you just don't know what the future holds for you and how you might feel about that in 10 years.
Of course, if a hysterectomy is ultimately recommended by the gyn/onc, then you'll want to consider keeping your ovaries if they are healthy. Mine have worked beautifully for 9 years now, and I'm very glad I kept them.
Also, please ask your doc about the HPV vaccine. After your pregnancy is finished, you might be eligible for it. It will help protect you against other strains of HPV to which you might not have been exposed. We certainly want to minimize your chances of having to deal with this again.
Good Luck! Please feel free to ask us any additional questions, or just pop in when you need extra support. Please keep us updated on what course of action you choose to take.