Thanks for the query
There can be some semen and ejaculate which can cause pregnancy very rarely on intercourse.
It is better to take plan B to be on the safer side.
Hope this helped.
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.