This is pretty tough. Even when using a condom he is still at risk of getting the virus. The only thing I would think of would be to poke holes in a condom but your chances of getting pregnant that way wouldn't be as great as if you didn't use a condom.
Other then that there is artificial insemination, sorry but it is a tough position to be in when one person doesn't want to risk getting the virus. I do not wish it on anyone don't get me wrong but my opinion is it works a lot smoother when everyone knows the risks and are ok with knowing they may get it one day.
My ex husband and I never used condoms and we were together 4 yrs and he never got it.
I wish you the best of luck on getting pregnant! I know how exciting it is when Trying to conceive