Hello dear.
Understand your concerns.
Withdrawal method is not 100 % effective.
Precum before the ejacualtion enter into the vagina unknowingly during the intercourse.
It contain sufficient sperm concentrration that cause pregnancy
You can take
I pill with in 72 hours of the sex.
If 72 hours has been crossed then wait for the period to come.
If period will delay by the 8-10 days then go for urine pregnancy test and or blood
HCG to confirmt the pregnancy.
If you will be pregnanct then still you can terminate intrauterine prregnancy by
abortion pill under the advise of the gynecologist.
Avoid
stress, take healthy diet, drink plenty of water adn do regualr exercise.
I hope this will help you.
Thanks
Dr.sagar