it difficult to get pregnant if the father drinks too much?

Is it difficult to get pregnant if the father drinks too much?

Yes, since alcohol can affect the sperm's condition. It could lower the sperm count. Maybe your partner should have himself checked by a urologist.
Furthermore, combined with the man's drinking habits there is an extreme risk of catastrophic birth defects, mental retardation, or straight miscarriage that can badly damage the woman's system, which might prevent any future reproduction ability.