Sonoline B Fetal Doppler

Loni • My name is Loni & I am 22 years old. I am a single mom to a 3 year old son. I have hypothyroid, PCOS, MTHFR, PAI-1 & Protein S Deficiency. (Currently pregnant!)
How soon did you hear your baby's heartbeat with this doppler?? I am 9 weeks 4 days & having a hard time finding it. Is it normal to not hear it yet??