Hello girls Today I was sent for an ultrasound to find out the exact d…

Hello girls Today I was sent for an ultrasound to find out the exact due date because I don't remember the last period date! I went for an ultrasound at 8 weeks according to my approximate calculations, I know when the baby was conceived too, it also comes out at 8 weeks. They said on the ultrasound that they can't hear the heartbeat ? It's free ultrasound that they send, could it be that their equipment is not very good and I need to go for a paid one? I'm going tomorrow, booked in! In short, there's also nausea present ? Give me some advice?!