@kathldn, I had to read and re-read your question and the context a couple of times. As there sounds like their is a bit of subtext.
First you are away 3 nights a week for driving lessons, that sounds strange. Normally the driving instructor would supply the car, on reading your replies it appears the arrangement is really for you to go to the countryside for 3 days a week to hang out with your parents. How long has this been going on?
It is not unreasonable to ask someone to call to let you know they got home safely. Especially as you have explained it is for peace of mind.
The real concern however is that your husband feels the need to go and get extremely drunk. You say he has a high stresses job but does not drink that much when you are there!
He is a grown man about to have a child and his wife is only spending time with him on the weekends. I hope you do not have a list of tasks he needs to complete every weekend.
So between you Swanning off midweek for 3 days, coming home and maybd telling him to do tasks or what your parents said etc etc, do you think he is getting any down time just to enjoy the pregnancy with you and coming to terms of being a new dad or are you taking this away from him?
While it is extreme reaction, going out drinking once in a while and getting the last hurra in before the baby comes, may be immature but not unreasonable if there is not other outlet being allowed!
However remember the fundamentals, men experience love and caring through actions, doing things together and not words.
The reality is that you are deliberately spending time away from him and while it is immature he would most likely see this as a rejection of him, rather than a validation that you trust him
You need to communicate, just the act of taking him aside to sit down and talk with the clear intend not to argue, control him or tell him off and listen could resolve the situation. Ask him why he feels the need to go and get hammer, while you are away?
*Does he think it is a free pass?
*Are his mates peer pressuring him? Is he unable to tell them no?
- Does he feel once the baby cones he will be unable to go out and have a drink with mates?
- is he scared about the baby coming?
- have you completely changed how you are treating him, now you are pregnant?
- are you scared about the change in life and not seeing or listening to him?
- does he feel like he has to support you and the baby and it is all on his shoulders?
- is he pissed off or feeling rejected because you are swanning off 3 nights a week?
Have that discussion rather than focusing on him texting you. Understand the reason for the behaviour rather than prescribing a solution