Could the ‘lost’ ovum mentioned above still be fertilised if sperm reach it before it expires?

Explanation: sperm can survive for up to 72 hrs , if it reach the fallopian tube too late the egg will be gone

answer:

there is no cure for hiv, although antiretroviral treatment can control the virus, meaning that people with hiv can live long and healthy lives. most research is looking for a functional cure where hiv is reduced to undetectable and harmless levels in the body permanently, but some residual virus may remain. most commonly hiv-antivirals are taken also known as nucleoside/nucleotide reverse transcriptase inhibitors (nrti's).