Elective fertility treatments?

I want to get pregnant at a certain time for family reasons. I was wondering if I can take fertility treatments during when I would like to conceive? Can I get opinions on this? Basically someone I live is going to die probably within two years and I really would like for them to meet the baby. Any help? I haven't struggled with infertility in the past but I don't want to have to wait a whole to get pregnant again.