Me and My girlfriend met on aug 2nd 2017, and we performed hand job , after sometime i did fingering for 5-10min . we both are wearing pants and i washed my hands before fingering . but Im in a doubt that I didn't cleaned my hands properly ( may be some sperm particles may stick in nails right ? ) . so Iam worried about my girl's pregnancy . She had her periods on 4th-5th aug ( just after two days of fingering ).and now 13th and 14th aug she is getting headaches . Please let me know how much chances are there ?