I too thought my ‘husbands’ cocaine use was recreational. As you say everyone does it now. (except for a few of us)
Before this it was once, twice a year max. It only, in my opinion takes a stressful situation like my ‘husbands’ trial for him to take it to the extreme. Drinking to excess, sniffing and making himself really ill. It made him feel depressed which he certainly had never been before, he was such a happy contented bloke. Always smiling.
No more though, his choosing to use coke and this causing paranoia have ruined our happy lives. I’m now left to cope.
Your boyfriend has to want to stop himself, only he can do this. You really need to take care of yourself through your pregnancy without the stress because it will make you ill.
Hopefully he will come to his senses and all can be made well. Until he does look after yourself.