My(25M) gf(25F) just told me she’s pregnant, I’m freaking out a little

I’m losing my mind a little, I got home from work minutes ago and my gf told me she’s pregnant. This wasn’t something we’d planned as I didn’t think either of us were ready to have kids. I’ve read loads on the subject, I know it can be scary and that kids are a lot of work. We’ve been together for 4 years, and this is the only serious relationship I’ve ever been in. We live in a 2 bedroom house, which she pays half the bills for. My job isn’t the best, I’m a gas engineer and I’m in training. I still don’t get paid much, and she pays half my bills. This is probably stupid but I feel like I can’t provide for a kid. We’ve got debt too, back when I was working in a warehouse I got into a lot of debt, and even though I’m making more these days it’s still hard to pay it off. I have a huge amount of anxiety from my past so I generally struggle with life anyway. She’s given me some reassurance, and told me that she’s only about 2 months pregnant. I keep jumping from one thought to the next, “What am I gonna do for money?”, “I wonder if this is real or just a dream?” “What if I ruin this kid?”. It’s hard to think of anything else when this is the only thing on my mind. I’ve never felt this way before, and I don’t know how to cope.