I don’t get the feeling that it would be the right to rush into another pregnancy. I’m sorry that you regret your decision but another pregnancy may not make you feel any better about the choice you made. I would try to make peace with your decision.
You have a chance now to finish your education, live with your partner at a point you choose to that is actually the right time, get your career sorted and then plan a family together. All the reasons you had before for having an abortion, which you now say were just excuses, you can make sure that those things are not even there in the future.
I think if your partner is a good man and you speak to him about your feelings, he should tell you the same.
When women become pregnant unplanned, of course it can all work out, but I really would take this as an opportunity to choose when you have a baby as it will be so much easier and enjoyable in more stable circumstances.
I say this as a woman that had my first child at 24, so quite young. We had bought a house together, had both finished Uni and had careers and had no doubts at all about starting a family. We’d have coped had it happened earlier but I’m so glad we got to choose the time when we were really stable. Give yourself the chance to start your career after uni, you may decide you don’t want children for quite a while if you enjoy your career.