Sperms survive for variable times in air. Generally once the semen dries up on external surfaces the sperms are dead or incapacitated. However if was fresh semen that has entered your vagina then there is a possibility of a pregnancy.
The best way to avoid any stress of an unwanted pregnancy is to use a contraceptive method. If you are not on any pills or injection, then you can take an emergency contraceptive pill also known as a morning after pill within 72 hours to avoid a pregnancy.
Visit a family planning clinic or a health care provider for a more thorough discussion on emergency contraceptives.
These Q&A’s are for educational purposes and should not be relied upon as a substitute for medical advice you may receive from your physician. If you have a medical emergency, please call 911. These answers do not constitute or initiate a patient/doctor relationship.