no heartbeat on angel sounds doppler!

Jacqui 💕
Im 10 w 4 d, bought the angel sounds Doppler today and heard nothing but my own heart beat?! Head the babies HB twice during my scans at the hospital but that was two weeks ago. All my symptoms have completely gone, I'm so worried! This happened to anyone else? Or should I be calling the dr for an appointment ??
Please share your experiences with fetal dopplers?