Is the risk of the procedure greater than me living with this?
You have risk of complications with your EP procedure and virtually not physical risk to the PVCs themself. If the emotional stress is worth the risk, then yes, if you are worried about sudden death and you have a normal heart, your risk of major complications is greater with the EP procedure.
Could this NSVT be a result of the first EP?
How long do I have to wait to get pregnant after EP and can I get pregnant without having EP?
You don't have to wait.
If you have a normal heart, there should be no problems getting pregnant.
Is ablation of NSVT higher risk than ablation of AVRT?
Yes and it has a lower success rate as well.
Could I have always had this and just triggered the AVRT to kick in with a few beats of NSVT?
That is very possible.
Remember, this is only advise because I don't know your whole case. In general, the least invasive approach is better for PVCs/NSVT unless it is very frequent, you can't live with it. If they are right ventricular outflow tract PVCs, they are easier to ablate than PVCs from other locations in the heart.
By the way I am 29 years old and female. I did not mention that