Hai I & My Girl Friend Participated In Oral Sex

Hai I & my girl friend participated in oral sex on 27 of may ND she has to get periods on 25 but delayed ND previously she had irregular periods continue sly so she used ovarl l ND cured but on the day we have participate in oral sex our private parts have been touched .nd I don't know weather im on precum or not (hope not) I heard that precum can cause pregnancy .so for safety I have gave her m pill (levonorgestrel) after 24hrs ..today date is 6-06-16 ND she didnt got her period till now im feared .plz clear me out of these doubts ..weather she is pregnant or not ND y she is not getting periods till now is there any effect of that m pill