Alcohol effect on sperm ?

my fiance and i have been ttc for a little over a year now. we are young (early 20's) i have been prego twice before one abortion-not my choise- and one miscarriage about a year later. both of those occured over 3 years ago. my periods are sooo irregular i have never had a 28 day cycle. its usually a 3-6 month gap between my cycles. anyway my question is have been thinking this entire time that it was my fault we couldnt conceive until i came across a few articles about how bad alcohol is for sperm count. i was wondering how damaging alcohol actually is bc he drinks a little almost every night. dont get me wrong hes not getting plastered or anything but he def has more than the reccomended 2 when ttc