How Does Taking Prolutan Effect The Regular Menstrual Cycle?

now i am pregnent of 2month.my docter give a prolutan depot.i am decided i abprtion my child beause i have a 2years child.if i abortion my child nobody knows about this.so i take a injection after abortion.next month when my meanstrual will start then i will tell about this.my question is my meanstrual reguler after abortion if i take a prolutan