Backstory - been with DP for 6 years. He has a DD and I have no children. We conceived 3 years ago, DP persuaded me heavily towards an abortion. It was the right decision in hindsight but I still remember how upset he was. It made me think about how happy he was when his ex was pregnant with their DD (he told me when we were dating) and I kept thinking, well why am I any different? He promised it wasn't me, it just wasn't the right time but reassured me we would have children together eventually. I terminated the pregnancy.
Fast forward to last year, I was diagnosed with PCOS, I have severe endometriosis and subsequent scarring. DP has a low sperm count, my consultant advised me to try for a baby now if I wanted kids eventually. We were given a 5% success rate, even with treatment. DP agreed we would try.
Anyway, somehow I'm naturally pregnant. 8 weeks. I found out at the fertility clinic, just before my HSG that I was pregnant. So it wasn't a shock to him... we were at a fertility clinic.
He hasn't shown one bit of excitement, the pregnant is like an elephant in the room and we don't talk about. The conversations we have had are negative, "I'm worried about getting a mortgage" and "It's a huge change, we won't get to do things on a whim anymore" "it's a shock" etc. Literally nothing positive has come out of his mouth.
I'm in bed in tears because he clearly isn't interested, is he? He says he will come round but at this point, a corpse genuinely has more excitement.
Our relationship wouldn't survive another termination. I resent him already for not being interested. I'm so torn. Do I bring a baby into the world, knowing it's father isn't interested? Knowing it's father was crazily excited for his DD but not this child?
I am in a good position, I am in a managerial role where I qualify for enhanced maternity pay. I have a small amount of savings, not a lot, but enough to help. I also think that I may only get this opportunity once but that I deserve someone to be excited with and for me. For someone to be interested... 
It's cruel and heartbreaking knowing we were about to embark on fertility treatment and now he's not interested in the slightest. It's like he's going through the motions but he's not really here, if that makes sense?