However, it is very important to have your condition stabilized with drugs before getting pregnant and throughout your pregnancy.
Fetal development can be impacted by maternal thyroid hormones.
If you decide on RAI, it would probably be best to wait long enough after for your condition to re-stabilize before getting pregnant...that can be up to a year or more.
Read all you can about RAI. It is a permanent fix for hyper, but realize you will be hypo for the rest of your life afterwards.