Uy mama, light spotting after a transvaginal ultrasound is usually normal naman, happened din sa isang mum friend ko last year, pero since you've been spotting for 3 days na, mas safe talaga na i-check mo with your OB para ma-rule out kung may irritation or something else lang, lalo na if may cramping or heavy bleeding after. I know it's scary pero better safe, di ba? Keep us updated, thinking of you!