Alcohol, Drugs & Ttc

So Me & my fiance have been TTC for 8 months now. I don't know if it has to do with our fertility or even if we can have any. So my question is does liquor & drugs cause infertility like for my eggs & his sperm count to go low? Like Hennessey, Smirnoff & other drinks & the drugs like bars & weed other stuff too but only like once. My fiance is 19 & I'm 18 yes I know we are still young but we got everything we need. We both started drinking & doing other stuff at a young age like 12 yes dumb I know & I stopped at 16 & he stopped at 17. We haven't we haven't did any drugs or drink. Just wine but not to much. I also want to know if it doesn't can we drink once in a while.