How To Prevent Pregnancy After Having Sexual Intercourse?

Hello sir,
This is Kiran from Bangalore.I have been engaged recently and will be married by the end of this year.I recently had a intercourse with my partner 5 days back exactly without a condom.I made it sure that all the semen is out of the vagina, but i still have some fear for my partner of getting pregnant.Could you please suggest a way out immediately without any chances of getting abortion(if any).

Thanks in advance.
regards,
Kiran