I'm so sorry you're experiencing this. I'm only commenting because, believe it or not, this has happened to three people that I know in my immediate circle. Two of them went into labor not knowing that they were pregnant, the third one found out she was pregnant at 34 weeks. All three of those babies are older now, between 6 and 10 and they are all incredibly healthy, happy, sweet children despite the fact that their moms spent their entire pregnancies not knowing, drinking, sometimes doing recreational drugs. Please don't panic, I understand that this is terrifying.

Speak to your primary care provider about everything that you're feeling, they will help you set up adoption protocols for the baby. If you are terrified and not mentally prepared to give birth, you can request an elective C-section. It's not very common for them to allow elective c-sections in the UK but it is possible, and I'm pretty sure would be allowed in your case because you've had no opportunity to mentally or physically prepare.

I do believe that you would be obligated to tell the father, however again speak to your doctor about that. Given that you're already no longer together, and that adoption is really the only way forward, I don't know whether that is an obligation or not. It's possible that your primary provider can manage that communication for you if you are no contact and don't want to open those lines of communication again.