Hi there. I'm sorry that you have to make this decision. Have your Doctors swayed you either way? I know there is a very real chance that you could lose your fertility, and if you definately want a sibling for you child, or are even unsure, I would probably suggest that you do harvest eggs. Obviously, you could try naturally down the track and if nothing happens in say, 12 months, then you will have those eggs to fall back on.
My husband and I were very lucky. He was told he would never be able to have children from quite a number of procedures (including a massive dose of chemo as a child) and we conceived our precious little son after about 3 years and our 2nd child after about 3 months. So, there is always hope but are you prepared to take the possible risks? Only you can answer that.
Good luck.
Krista.