Alcoholic?

My fiance drinks every night

He doesn't get drunk, but I can tell that it's influencing him

He told me today that he was going to go out driving with one of his friends, only for me to call him later while he's 5 beer in

He can't sit at home and do nothing for a night, he has to be drinking too. He starts pretty much as soon as he gets home

He tells me he just likes the taste, but every night?

My father is an alcoholic, my grandfather had to get his stomach pumped 4 times because of alcohol, and by the end of it he died with a beer in his hand, of liver failure. Both my grandmother, and grandfather on the other side were alcoholics, and they were very toxic people.

I've been around a lot of alcoholics in my life, and I'm starting to notice he's behaving this way too, but of course he denies it

I'm currently pregnant, and his drinking is seriously starting to become a problem for me

We got into an argument today because I had an issue with the fact that he told me he was going out with a friend, driving, only to find out he's been drinking later on, and he has to get someone to go pick him up. He thinks he should be allowed to do whatever he wants, without me being upset, because "at least he told me". And sure I guess, but I do have a problem with the drinking every night.

I don't know what to do in this scenario, because I'm starting to get fed up with the drinking, but I do love him.