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Morning after pill causes irregular & heavy period. However, since you feel dizzy, you may have anemia. You should see your doctor to have a blood test and exam. What kind of abortion did you have? Mechanical (surgery) or medical (medication)?
Another concern is the surgical abortion might have caused perforation of the uterus and bleeding from there. You should have ultrasound if it is suspected.
If you have small perforation, it would close on itself. If it is bigger, the bleeding would not stop and you need to have a surgery to stop it. But you need to have ultrasound to see if you have perforation or not.