Waiting for a scan ( womb )

Before Xmas I'd had some post menopause bleeding . GP took me off vagifem and told me to return at the end of Jan  if it didn't stop .It hasn't got any worse but I still have random bleeding . She's referred me for a trans vaginal scan but two weeks later I still haven't had an appointment letter come through . 

Is this normal or should I have heard by now .should I chase it up ? 

Thanks in advance