Able to find both heartbeats on a doppler?

My fetal doppler is being delivered today and I'm 9 weeks today! I'm so excited and I know it will calm my nerves and reassure me to heart their heartbeats (I'm anvery anxious person who had a difficult loss in January.) my husband is concerned that since they are so little, and typically have the same heart rate (during sonos at least, last one had he 154 and 155 bpm) that I will only hear one heart beat and it will cause me to freak out. I won't lie I know that if I only hear one it will be cause for concern. So how many of you ladies were able to get both heartbeats relatively clearly at 9ish weeks?