Re: HIV
^Agreed.
As u said PCG, he prefers not to tell his parents for their lack of understanding about how he extracted it or whatever, yet he realizes that you do understand. Then, you ought to sit him down and tell him that you too want children and you do love him, for he is your husband and a life partner. But, he should convince his parents and explain the situation to them in a way suitable for him, as well as them, so the pressure does not build on u in any way because you're not at fault/in the gray here. It goes both ways. You look after his dignity, he looks after your wishes and your health.
However, being desi, expect to hear things because the mind span doesn't not extend to the point where people think of alternative and often will judge on the pretexts such as 'oh she couldn't become a mother' etc..etc..
So, it's best you do not compromise your health, and if you do love him and want to invest in a united future together as a couple. Talk about your options, explore what could work to satisfy everyone. Adoption is definately an option, and not to mention tons of sawab too because you would be giving an orphan/less fortunate child a better living. With the correct terminology, parents can be convinced.