Thanks for the query.
I understand your concern.
If your girlfriend is around the period of her ovulation at the time of intercourse, better to go for emergency contraceptive pill within 72 hours of intercourse to prevent the possibility of pregnancy.
Hope this helps you. Take care.
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.