Welcome to HCM
Read your prob, there are some common cause of vaginal bleeding during sex
are cervical dysplasia
, crevical polyp,adenomyosis
,uterine polyp ,tumor n infection with yeast, tricomonas, chlymidia, n cervicitis
. as your scan is normal then you should rule out any infection n cervicitis n start proper treatment after advising of your doc. dont worry this is curable.