Congratulations on your pregnancy!
I think it's very understandable that this is a tricky situation and you weren't expecting it. I also came off hormonal contraception a few years back and I resent the idea that we have to take hormones if we want to prevent pregnancy. I'm so happy that I stopped taking them. Naturally our right to not take hormones brings with it challenges in contraception. I used other less effective methods for several years, and then now I'm pregnant after one slip-up. My partner and I were very new to each other and it wasn't ideal either. Different to your situation but I can empathise. I felt so shocked and scared, because it is such a huge thing, and you really don't know how you'll feel about it until it happens. You could tell yourself you'd have an abortion, but then once you're pregnant you couldn't do it. My partner also freaked out and wanted an abortion. I had to talk to him very compassionately and admit that I was sorry to put him in this situation, and I wished I could do what he wanted but the idea of termination felt barbaric. I also feared that if I had an abortion now, maybe I would struggle to conceive later and deeply regret it... I've had lots of friends who struggled to conceive.
Some of the comments on here have been very harsh in my opinion. I would like to say that it's absolutely okay for you to come off hormonal contraception. It's also okay to be pregnant and think you could abort but now not be able to. I think you need to take responsibility for the fact that your part in this has led to a very tough situation for your partner, and he may feel angry/betrayed/so on and that's also okay and you need to respect that. He may also be angry with himself. My partner said he wanted an abortion but still to stay together but I knew that if I did that I don't think I could have stayed with him, because a little part of me would have resented him. I think you might also feel the same... so you have to make the decision without expecting anything from him. Just respect his process and his feelings. If you choose to go ahead, and I hope you do, but do what feels right for you (not out of fear of losing him) - just be compassionate of his feelings and assure him you will try to do everything in the best way possible - you won't withhold access to the child, or hold things against him, etc. You can make decisions in a friendly and respectful way whether you continue as a partnership or as friends (and that depends on him too). I think you will get the best possible outcome if you honour your feelings, have a dialogue with him and really listen to him and acknowledge his feelings. It's very important that you acknowledge his feelings and try to understand how hard this must be for him and respect that, if you want to have a positive relationship in any sense going forward. Also try to really calmly explain how you feel about it so he can empathise and feel less angry/betrayed.
For me, I had to say I would have the baby alone, and I assured him he could choose his involvement and I was sorry for the situation, but now I was pregnant I just felt I didn't have any choice either but to keep it. My partner took several weeks to come to terms with my decision but now he is being supportive. I still have it in my mind that if I have to go it alone I will, but I want to always honour my partner as the father and what's best for the life blooming here... I think ultimately we can't expect too much and just respect each other's feelings even if they change along the way.
Big hugs and I hope you can get the best outcome. No matter what, don't feel guilty, you are human, and please make the decision that is right for you, that you will not regret. Big love.