OP, please report your thread and ask for it to be moved to Relationships section. The replies to your are gaslighting, vile, nasty and abhorrent. You don't deserve it, you have done nothing wrong. You will get better advice there.
You were not wrong to look at his phone, you had suspicions and they were found to be correct. My husband and I don't have any secrets or passcodes on our phone. It's not normal in a marriage. He grabs mine to make a call or check something, I do the same. I have never heard of people in a committed relationship keeping their phone away from their partners. Something is seriously wrong there if people do this.
During pregnancy is the most common time for abuse to start, because women are vulnerable and he has you trapped. He has been abusing you at least verbally and emotionally. Calling you names, refusing to discuss issues in your relationship, silent treatment, it is all abuse, and you don't have to stand for it. HE is the controlling one, not you. He is abusive and should be supporting you as you need him now more than ever. And what does he do? Watches porn and blames you for it! It is a gaslighting pig. You really deserve better and should strongly consider leaving him. He has hateful, cruel, nasty and controlling. He is not husband material or father material. Please leave him, and make sure you give your child your name and he is not on the birth certificate.
You deserve to be treated better than this, especially when you are so vulnerable and having been having bleeds. He really is scum for how he has been treating you. Please leave him, before he destroys your self esteem completely.
And please get Mumsnet to move this thread to the Relationships section to avoid the victim-blaming vipers on here. In Relationships you will get much better advice, and that is where you should have posted.