Hi there, I have understood your concern and I will suggest you the best possible treatment options.
Please do not panic.
First of all, you can get USG done to know about the completeness of the procedure. If USG shows empty 
uterus and no remnants of the 
pregnancy are seen ,then you need not worry at all. You don't need to get surgical procedure done.
As such, WHO, World Health Organisation, recommended dosage of the 
abortion pills is as follows - Tablet Mifepristone 200 mg followed by Tablet 
Misoprostol 600 to 800 mcg orally or sublingual or per vaginal route after 48 hours.
Please take care to get it done under medical supervision.
Please get counseling done for future, use a suitable 
contraceptive method. Learn about safe and protected sex activity, This helps to prevent unwanted pregnancy and STDs.
I hope this answer helps you.
Thanks.
Dr. Purushottam Neurgaonkar