I would say its more then likely they wont see a HB but they should be able to confirm a gestational sac and probably a fetal pole at 5wks4days via an interna; scan.

At 5wks3days they couldn't see a fetal pole within the gestational sac at mine but at 6weeks they saw the fetal pole and HB. So a huge difference in just a few days. Both were transvaginal.