Is It Necessary To Have Complete Course Of Pills To Abort Pregnancy?

Dear sir, my wife last period date was 17 March 2015 but it didn t. After testing it was positive, so my wife take this unwanted kit on 23rd march . phsyscian prescribed us to take first one oil and then after 48 hours the next two pil and after 12 hours the last two pil. My wife after taking first pil then after 48 hours two pils , the sevier bleeding started 2 hours later of taking pils .The rest two pils will my wife take after 12 hours as by physician prescribed or not. She should complete the course or it is not necessary to complete. Plz kindly suggest.