Ultrasound

Hello guys, ask ko lng bakit kaya gnon.. Nagpa ob ako kahapon dhl my brown discharge ako.. Then nag transvaginal ultrasound dn ako.. Supposedly 9 weeks ndw akong preggy dhl ang last mens ko is december 2 to 7..pero bkit sa ultrasound 5 weeks and 4 days palang..with gestational sac and yolk sac palang.. Possible ba to? Imean nangyayare ba to talaga.. Thanks