Doppler

Amber
I'll be 16 weeks tomorrow and due to complications that I've had during this pregnancy, I've ordered a Doppler so I can check on the baby between ultrasound visits. My Doppler is being delivered today and I'm so excited/nervous. I know if I don't find my baby's heartbeat, I will freak out. What are some tips to help me find the heartbeat? Also, has anyone not been able to find the heartbeat at all and everything still be okay?