pre cum questions REALLY NEED HELP PLEASE!!!!

i was wondering if anybody can help me and my gf had sex about 2 weeks ago and her period was due 3 days ago we had unproteced sex but i didnt cum inside of her or anywhere near her for that matter we kept going back and forth with sex and oral sex and i was wondering if my precum could have gotten her pregnant im really scarred and so is she we are not ready to start a family and hopefully if she isnt pregnant than we will deff be more carefull and take more precations but please can anyone help me im really frightend im not trying to be a dad yet and i didnt think precum could get her pregnant at the time but im getting really scarred now and its looking like it might but im not sure it may just be really late does that happen? ughh if anyone out there can help me please do so me and my gf are scarred and we want to know everything we can