Welcome to HCM.
You both were on top of each other with unprotected after her period ended but did not sex.Also she took Emergency pill within 50 hrs.
So chance of pregnancy
is rare or very negligible.Your girl friend can wait for upcoming period and if missed period occurs,then do a home pregnancy test with urine for HCG
after 7 days of period date. Check the result and consult with doctor if needed.
Pre-cum or pre-prostatic fluid is clear,colorless fluid that is excreted on arousal in man prior to exact ejaculation but similar to composition of semen. It contains little amount of sperm and chance of pregnancy is very little if it occurs around ovulation time.
Be aware of that and practice safe sex