Missed period with negative Hpt.

Hi doctor. Me n my gf had little intimate moments on december 5th.we dint have sex.the problem is i touched my penis which had pre.cum on it and after 5 mins i fingered her with same fingers. We waited for her periods which was due on 26th december.usually for 4 days she gets periods and delays at times. she dint get her periods on expected date. I was worried so 2 days after missed period we did Home Pregnancy test and the result Was NEGATIVE. On 31st december night she got white vaginal discharge that she gets before periods. We waited and again after 5 days we did home pregnancy test using velocit home preg.kit. THE RESULT WAS NEGATIVE.(7TH DAY OF MISSED PERIOD) Again after 5 days we took home pregnancy test using velocit home preg.kit to confirm and THE RESULT WAS NEGATIVE (12TH DAY OF MISSED PERIOD) She still has not got her periods doctor.Today is january 12th. Im getting worried about this. Is she pregnant? Or periods is delaying? Please help me doctor.