I'm so sorry for your loss.
My doctor's office usually does a dating transvaginal ultrasound to see how far along you are. They usually let you listen to the heartbeat. Do you know if your office does an early dating ultrasound? Can you ask them? Are you sure of when you ovulated (charting?) because they may want to see how far along you are and that requires ultrasound measurements.
Also, with your history of loss they may do one just to check. The only thing you can do is call and ask. If anything they will take note of your call in the office and when you get there they might see.
The only thing you can do right now is remember today, to the best of your knowledge, you are pregnant and love your baby right now. I would go ahead and ask the doctor. The worst they can say is no, right?