Thanks for your query.
Read and understood your history.
The precum may not have any sperms particularly if you have not ejaculated before.
It is difficult for the pregnancy to occur only with precum.
Yet, on a precaution your girlfriend can take Unwanted or I pill tablet if the sex is within 72 hours and be relaxed.
I hope this answers your query well.
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.