Hey mama, glad you got your period na at not pregnant! For the transvaginal ultrasound, honestly you really need to check with your OB kasi different clinics have different protocols, some say it's okay during your period, some prefer waiting a few days after, so better safe than sorry na lang. One of my mum friends had hers rescheduled because of her period, pero iba-iba talaga, so best to call your clinic and confirm with them directly bago ka mag-abang pa. Fingers crossed everything's normal na lang with your results!