Congratulations on your pregnancy!
While I can't tell you how they treat dysplasia when you're pregnant, I can tell you that it takes along time to progress to cancer. My guess, uneducated guess, would be that they'll watch it closely while your pregnant. They probably do a colposcopy to see how bad it is.
My sister in-law is very poor. Never went in for her PAPs because she didnít have insurance. Well, she got pregnant and went to the OB/GYN and they of course did a PAP. Long story short, she had cancer of the cervix. They watched her very closely and gave her a c-section as 37 weeks because they were afraid it would spread. She had a c-section and a hysterectomy at the same time. She's fine now and her little boy is 4.
If she can get through her pregnancy with cancer, I'll bet you can get through yours with dysplasia. They'll probably treat you after you give birth.