4weeks after abortion positive test

No judgment please I got a abortion 4weeks ago (I never wanted to get one) but my boyfriend made me get one because of his personal reasons. Has anyone had high hcg levels 4 weeks after abortion I got my hcg tested and it was 74 I got a ultrasound and the abortion worked could this be a new pregnancy?

I’ve been taking test the line got a bit darker over the past 3 days but I’m wondering if it’s jus my hormones?