confused found 2 heartbeats with a fetal doppler ???

kay • mommy of a 6 year old princess 👑 3 mcs ... and finally pregnant with rainbow 🌈🙏🏼 due Oct 2 -18

help im 13 weeks and 4 days pregnant and is the 2nd time that i found 2 heartbeats in two different places right side like always and left side ! could be the placenta? what yall think? i know is not my heartbet because is slower