You HAVE done amazingly well in stopping drinking and staying off alcohol so far.
Unfortunately I think a lot of the well meaning posts suggesting non-alcoholic versions of drinks are likely to be either from people with no experience of problem drinking or who have unhealthy relationships with alcohol themselves.
In my personal experience (family full of addicts inc 5 with predominantly alcohol addiction) and as an ex nurse I am of the opinion that if you have a problem with alcohol you're better off not only not drinking alcohol but not drinking alcohol free (and they're usually not completely alcohol free either - which can cause issues with a physical addictive response) "fake" drinks either.
It's too tempting when you trigger the memories with a taste of something similar I think it would make it harder not easier for you.
Please confide in your midwife - they will have experience with this it's very very common and they need to know anyway as it informs your healthcare.
You need support to continue to stay off the alcohol, I would say permanently as drinking as much as you were (are you even being completely honest with us? Yourself? Is it possible you were underestimating?) strongly suggests you are dependent.
Luckily apparently not physically as you were able to stop without ill effects - as have all the addicts in my family, didn't mean they weren't addicted.
Everyone I've ever come across who has a problem with alcohol and tried to return to drinking moderately has been unable to do so.
The ones that have succeeded in controlling their addiction are the ones that have stayed off altogether.
But the ones that have succeeded also had support from others - hcps, community groups, church groups, personal therapy...
Some also did LOTS of reading on the subject there are loads of books and articles but make sure the source is well researched and reliable.
Everyone has their own thing that works for them.
I wish you SO much luck with your pregnancy you're clearly so looking forward to being a mum which is lovely.
And very good luck with continuing sobriety too. 