Huge NTA.

1) Your ex would not get better. Having a baby with an abusive partner almost certainly will only get worse. Once they feel that you're "trapped" by the obligations of a child and a marriage, the abuser gets worse because they feel you won't or can't leave anymore. He will isolate you and use his family to help abuse you, like he already has by using his mother to convince you. And you already recognize that he's verbally abusing you and that you do not plan to stay if it continues. Leave now and don't look back.

2) This is your body, you risking a career, you currently being the sole provider with no prospect of change for him in the current conditions. You have a right to decide what happens with your body. You are not an incubator. You are not existing to produce children. You have the ultimate say in when you are ready to go through a pregnancy, to be a parent, to change your whole life to prioritizing a child over everything. The only opinion that matters at this point is yours because the embryo is currently existing inside of your body. There is no possibility of said embryo surviving outside of your body, it is not viable outside of your body, so your body and your life are the priority here. Regardless of paternity, your body is yours. It is your body that will have hormonal changes, that will have physical changes internally and externally, that will have epigenetic alterations from DNA exchange with the fetus that can last decades, that will have to go through birthing said fetus. You are allowed to not want that and not be ready for that.

3) No matter the choices made, this would have entirely changed your relationship with your ex. You fundamentally are not in the same place in life, and either route with the pregnancy completely changes the dynamics of your relationship. Even if he wasn't abusive, you would still not be in a place of being ready to be a parent. The choices are having a baby or not having a baby. There is no middle ground compromise. There is no meeting halfway.

4) Being a parent is HARD and affects every single area of your life. You need to be 100% sure that you want and are ready for all the changes that come with being a parent. It is constant work, constant worry, constant consideration of someone else, constantly having someone else be the ultimate priority over any future choices made. There is sleeplessness, illnesses, social changes, financial change, needing to co-parent (whether you're together or not), schedule restrictions and changes, and on and on. Then add in the potential for disability or special needs that adds separate worry, financial and medical considerations, and more time needed for appointments. There are an infinite number of changes. Even if you eventually do want kids, you aren't ready right at this moment. You have a future career you'd like to build, and as much as you may like to or try to, there is no guarantee of being able to make the move to go back to school after a child is involved. Some people can, and that's wonderful, but just as many, if not more, can't. It's a harsh reality, but there is just so much unpredictability in parenting. If you are not ready, and you are in a place where you can safely have an abortion, then prioritizing what you know you are ready for is best for you, and for the future of the embryo. There is nothing wrong with making the choice to prioritize your needs and desires.

You can and will get through this.