Heartbeat

Tiana • I am 23 years old, I am married, have a 5 year old and my husband and I are having a baby boy! Due January 21,2017!
I am 10 weeks tomorrow and was wondering what app can I use to hear the babies heartbeat, I have an iPhone so I know certain ones won't work, but I have one and can't find the heartbeat, is it difficult to find on a phone app? I've heard the heartbeat and it's 167 but I want to be at ease