I think you need to get an abortion.
And I am usually against it unless nescessary.
This is necessary.
You have a lovely child who has suffered on account of the father already. Do not do this to another child!
Extricate yourself from this very damaging relationship. In a few years time you could be in a relationship with somebody decent and loving and have a great life for you, DC and potential DCs. You could have the chance to train/study, develop your career, engage with hobbies, friends, things you enjoy.
This pregnancy jeopardises all that.
Please don’t have another baby with someone whose actions have led to your child being “in need”.
And for gods sake get the coil in or the injection, remember to take your pill and use a condom.
If you miss one, you can get pregnant, if you have irregular periods, you can get pregnant, if you have reproductive apparatus, you can get pregnant!