TTC not sure if it's possible :/

Hi guys I'm very new to glow and so far I love this App, my feiance and I have been together for two years and we both feel we are made for each other, for the past six months we have been TTC. I've gone to my OBGYN and everything looks great and normal, but my fience takes methadone due too an accident he had awhile back and I read that it lowers sperm count, so I don't know if we would be able to conceive. If anybody has any tips or positive feedback it would be appreciated ☺️ thanks guys