To hear a heartbeat in your dream suggests that you are not confronting or recognizing your feelings. You need to approaching things head-on. Alternatively, a heartbeat may symbolize life or fear. Perhaps, you are feeling threatened in some way.
Psalm 61:1-4 NASB - 1Hear my cry, O God; Give heed to my prayer. 2From the end of the earth I call to You when my heart is faint; Lead me to the rock that is higher than I. 3For You have been a refuge for me, A tower of strength against the enemy. 4Let me dwell in Your tent forever; Let me take refuge in the shelter of Your wings. Lead Me - Aimee Weaver Designs