Boyfriend accused me of getting pregnant behind his back

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I really don't know where to start. I feel like I'm going mad and apologise in advance if this is a long story.
I'm currently 30 weeks pregnant with my first baby. The last few weeks my boyfriend of 8 years has been really distant, doesn't really talk to me and never touches me anymore. I kept asking if he was ok but yes was the answer all the time.
Recently when he had been drinking he eventually told me what was on his mind. He was worried about the arrival of the baby, the financial side of things (we live comfortably, it's not like we're really struggling but I understand times are hard recently), he won't be able to do anything after the baby arrives and that he was going to be an useless Dad. He wanted to end the relationship.
I feel like it's come out of nowhere. When I first told him I was pregnant he was happy, he was joking with silly names and reading books to prepare. It looks like he's had a change of heart. Either for the reasons he said above.. or for some other reason. I'm overthinking everything.
This weekend he accused me of getting pregnant behind his back.. which has really upset me. He knew I had to go off the pill because of migranes and we were using condoms. Eventually protection was not being used, ok, we didn't talk about it properly, but I assumed that because he wasn't reaching for protection he knew what could happen. And if it happens, it happens. Naive, I know. We should of spoken properly. We had spoken about having children in the past and we both wanted the same thing. Anyway, it eventually happened but the first pregnancy ended in a miscarraige. We went back to using condoms. And the same thing happened again. He stopped reaching for them. So he 100% knew what could happen without them. So I'm not sure how he can accuse me of planning this pregnancy behind his back.
I just need your opinions.. do you think he's panicking and blaming everyone except for himself, or is he trying to push me out of his life? I feel like everything's my fault and I'm not enjoying the pregnancy anymore. I really don't know what to do for my own sanity and for his.

My ex-husband did similar to this around 6 weeks before I was due, despite baby being planned by us both. Soon after the birth came the accusations he was seeing someone else from friends, some with evidence. However his behaviour had already deteriorated so badly I knew I needed out, we had separated before DS was 6 months old.
This might not be the case for you, but what I would say is make sure you're prepared for if you do want to walk away. When I realised I deserved to be treated better I sorted everything out from having separate finances, plans to return to work and a plan of where I could stay temporarily and long term.
Be prepared to look after yourself and your baby, you might not need to but it will give you more security knowing you can take care of the both of you.
Being a single mum was my biggest blessing, four years on I am in a great relationship with someone who cares about me and my DS and am now expecting baby no2.
Just remember no matter what happens you will be ok!