Hello dear
I understand your concerns.
I will give suggestion stepwise: 
1. First you should take unwanted 72 within 72 hours of unprotected sex. (BETTER TO TAKE AS EARLY AS POSSIBLE)
It is highly effective (95%- 96%) to prevent 
pregnancy if taken within 24 hours.
2. If your period will delay by the 12 days from the normal expected period date then you have to think about the pregnancy.
You should go for urine pregnancy tests and or blood 
HCG to confirm the pregnancy.
If above tests will come positive then you should terminate it by 
abortion pill (MIFEPRISTONE FOLLOWED BY 
MISOPROSTOL) under the advice of gynecologist.
Bitter guard and papaya will not help to prevent the pregnancy.
Avoid 
stress, take healthy diet and do regualr exercise.
Hope this may help you
Contact HCM for further health query
Best regards
Dr. Sagar