I’m so sorry to hear he hasn’t taken it well. I agree with others - shock is a really bad catalyst for panic responses (my partner was also in shock and told me that we couldn’t go through with the pregnancy). It depends on your relationship, but we got there by giving each other space from discussing it for a day or two, whilst still being gentle with each other. I tried to see things from his perspective (he was worried about money) and explained how I felt connected with the pregnancy and that I wanted to keep it (without bringing him into it), but then we allowed each other space to sit with it.
He came around after a couple of days - the biggest shift was from proactively standing in each other’s shoes - E.g. “help me understand what’s going on for you” and “could you spend some time seeing this from my perspective?”
When he saw things from my perspective, he admitted that there’s no way he could have an abortion and that his worries weren’t insurmountable. We sat together and talked through all the practicalities so we could make a plan (reminding him he wasn’t going to be raising a baby and earning a living by himself). I felt like I wanted to throttle him when he mentioned abortion, tbh, but I knew if I hammered him he’d feel backed into a corner, so I had to give it space.
as I say, this is really dependent on your relationship. It sounds like he does tend to come round, but if he’s seriously not willing or able to accept the pregnancy, then you might need to consider what your options are if you definitely do want to keep the baby (choosing not to is also a really valid decision but make sure it’s your choice and not his).
I did this too and quickly made a plan as to how I’d cope if he bolted. It cemented the decision for me and made me feel stronger about the pregnancy, which ended up reassuring him too, bizarrely.
Couple’s counselling could also be an option if you reach a stalemate?
sending love - it’s so rough when this happens.