ovulation confirmed but no period, what could be wrong??

tako

hi ladies, i track follicle growth via ultrasound, this cycle i have one 21 mm follicle and did the trigger shot, 3 days later we checked on an ultrasound and confirmed that follicle raptured and i ovulated. today is 16 DPO and still no simptoms of AF and no period yet, pregnancy test is negative. what could be wrong? is it possible to ovulate and not get period?? my BBT is still high