To help you organise your thoughts:
You want to have a baby and be a mum.
You do not want to be tied to a toxic man. He is vile and you have not even gone into everything he has done. He drained you financially (selfish!!!) and mentally abused you (had you FOLLOWED!). Shudder.
Are you financially able to support a child? E.g. do you have a home / secure job etc?
What I am unsure about is whether you are unconfortable with abortions generally or whether you want to continue with This pregnancy and that is why you are finding it difficult. What are your general thoughts on women having abortions?
Aside from that, you do need to understand this is very, very unlikely to be your only chance of having a baby. 34 is older than 21 but you are still fertile for many more years! If you were 41 the situation may be different. You will likely be able to get pregnant again in the future - this is not your only chance. No-one can say for certain but the odds are very much in your favour to be pregnant again in a couple of years when you are ready.
Can you research what steps could be in place to protect the baby and you from his abuse if you went ahead? I know people talk about birth certificates but what does that mean exactly? Could he take the child from school on a Friday and not return it to you?
Honestly, please relax. You still have to to decide. You have all the power to choose. You can have this baby and work hard to protect it from abuse - just make sure you are out of his grips and DO not start believing he will change his ways. He really really wont. He had two chances with his other kids already. What a prick. You can focus on thinking about how you will protect yourself from him to help you envisage life as a single mum.
I think I am rambling :) Haveba good day at work! Dont worry. You have time. Its fine. You have control and power and choice and autonomy. You can do what you like. Go with your instinct and make it work.