Yes you do have protections.
In the UK, once you are married things like houses, savings, cars become marital assets.
However it's more complicated than that. In a short marriage where you didn't make an original contribution to the purchase, no you probably wouldn't be awarded 50% of the house value. However, as you are pregnant, it's possible that a judge would award you 50% if you are to be main carer for the child, or would award you the right to live in the house until your child is 18 then the house be sold with certain proportions of the value going to you and your Ex.
The bottom line is, as you are a. married and b. about to have a child, then the fact that you have contributed less to assets is less important. The main considerations would be a. that your child needs to be housed and provided for, and awarding you percentages of a house sale is a means of doing that and b. that marriage does indeed give you rights of ownership over large assets.
You would certainly need to speak to a solicitor.
BUT, BUT, BUT - THAT IS NOT REALLY THE ISSUE HERE.
The problem is really this: you are an adult married to another adult. You have just as much right to control over your lives and finances as your husband. BUT HE DOES NOT THINK THIS. He thinks you are inferior. That you do not have as much right to make decisions as him. That he is in charge of you, your finances, your marriage.
This money stuff is simply illustrating a wider problem, and one which will NOT get sorted: that you are married to a controlling, abusive man. Now it's money. Next - will it be whether you go back to work? How you feed your child? Where your child goes to school? What your child will be called? Where you live? Where you spend Christmas? etc...
It doesn't MATTER if you are the biggest stress bunny over money that ever lived. It is still the case that HE HAS NO RIGHT TO DECIDE your level of involvement. And he thinks he does. Why? There is no other reason except that he automatically thinks of you as a junior, an inferior.
The fact that instead of apologising when this is pointed out to him, he shouts, bullies, closes down the conversation tells you the rest. If he can't control by persuasion, undermining and lowering your self-esteem, he'll do it by out and out bullying and aggression.
YOU NEED TO LEAVE. For both you and your baby.